3 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
4 2011 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "exceptions.h"
23 #include "arch-utils.h"
24 #include "dyn-string.h"
25 #include "readline/readline.h"
26 #include "readline/tilde.h"
27 #include "completer.h"
28 #include "target.h" /* For baud_rate, remote_debug and remote_timeout. */
29 #include "gdb_wait.h" /* For shell escape implementation. */
30 #include "gdb_regex.h" /* Used by apropos_command. */
31 #include "gdb_string.h"
32 #include "gdb_vfork.h"
34 #include "expression.h"
38 #include "filenames.h" /* For DOSish file names. */
42 #include "tracepoint.h"
47 #include "cli/cli-decode.h"
48 #include "cli/cli-script.h"
49 #include "cli/cli-setshow.h"
50 #include "cli/cli-cmds.h"
52 #include "python/python.h"
55 #include "tui/tui.h" /* For tui_active et.al. */
60 /* Prototypes for local command functions */
62 static void complete_command (char *, int);
64 static void echo_command (char *, int);
66 static void pwd_command (char *, int);
68 static void show_version (char *, int);
70 static void help_command (char *, int);
72 static void show_command (char *, int);
74 static void info_command (char *, int);
76 static void show_debug (char *, int);
78 static void set_debug (char *, int);
80 static void show_user (char *, int);
82 static void make_command (char *, int);
84 static void shell_escape (char *, int);
86 static void edit_command (char *, int);
88 static void list_command (char *, int);
90 void apropos_command (char *, int);
92 /* Prototypes for local utility functions */
94 static void ambiguous_line_spec (struct symtabs_and_lines *);
96 /* Limit the call depth of user-defined commands */
97 int max_user_call_depth;
99 /* Define all cmd_list_elements. */
101 /* Chain containing all defined commands. */
103 struct cmd_list_element *cmdlist;
105 /* Chain containing all defined info subcommands. */
107 struct cmd_list_element *infolist;
109 /* Chain containing all defined enable subcommands. */
111 struct cmd_list_element *enablelist;
113 /* Chain containing all defined disable subcommands. */
115 struct cmd_list_element *disablelist;
117 /* Chain containing all defined toggle subcommands. */
119 struct cmd_list_element *togglelist;
121 /* Chain containing all defined stop subcommands. */
123 struct cmd_list_element *stoplist;
125 /* Chain containing all defined delete subcommands. */
127 struct cmd_list_element *deletelist;
129 /* Chain containing all defined detach subcommands. */
131 struct cmd_list_element *detachlist;
133 /* Chain containing all defined kill subcommands. */
135 struct cmd_list_element *killlist;
137 /* Chain containing all defined "enable breakpoint" subcommands. */
139 struct cmd_list_element *enablebreaklist;
141 /* Chain containing all defined set subcommands */
143 struct cmd_list_element *setlist;
145 /* Chain containing all defined unset subcommands */
147 struct cmd_list_element *unsetlist;
149 /* Chain containing all defined show subcommands. */
151 struct cmd_list_element *showlist;
153 /* Chain containing all defined \"set history\". */
155 struct cmd_list_element *sethistlist;
157 /* Chain containing all defined \"show history\". */
159 struct cmd_list_element *showhistlist;
161 /* Chain containing all defined \"unset history\". */
163 struct cmd_list_element *unsethistlist;
165 /* Chain containing all defined maintenance subcommands. */
167 struct cmd_list_element *maintenancelist;
169 /* Chain containing all defined "maintenance info" subcommands. */
171 struct cmd_list_element *maintenanceinfolist;
173 /* Chain containing all defined "maintenance print" subcommands. */
175 struct cmd_list_element *maintenanceprintlist;
177 struct cmd_list_element *setprintlist;
179 struct cmd_list_element *showprintlist;
181 struct cmd_list_element *setdebuglist;
183 struct cmd_list_element *showdebuglist;
185 struct cmd_list_element *setchecklist;
187 struct cmd_list_element *showchecklist;
189 struct cmd_list_element *skiplist;
191 /* Command tracing state. */
193 int source_verbose = 0;
194 int trace_commands = 0;
196 /* 'script-extension' option support. */
198 static const char script_ext_off[] = "off";
199 static const char script_ext_soft[] = "soft";
200 static const char script_ext_strict[] = "strict";
202 static const char *script_ext_enums[] = {
209 static const char *script_ext_mode = script_ext_soft;
211 /* Utility used everywhere when at least one argument is needed and
215 error_no_arg (char *why)
217 error (_("Argument required (%s)."), why);
220 /* The "info" command is defined as a prefix, with allow_unknown = 0.
221 Therefore, its own definition is called only for "info" with no
225 info_command (char *arg, int from_tty)
227 printf_unfiltered (_("\"info\" must be followed by "
228 "the name of an info command.\n"));
229 help_list (infolist, "info ", -1, gdb_stdout);
232 /* The "show" command with no arguments shows all the settings. */
235 show_command (char *arg, int from_tty)
237 cmd_show_list (showlist, from_tty, "");
240 /* Provide documentation on command or list given by COMMAND. FROM_TTY
244 help_command (char *command, int from_tty)
246 help_cmd (command, gdb_stdout);
249 /* String compare function for qsort. */
251 compare_strings (const void *arg1, const void *arg2)
253 const char **s1 = (const char **) arg1;
254 const char **s2 = (const char **) arg2;
256 return strcmp (*s1, *s2);
259 /* The "complete" command is used by Emacs to implement completion. */
262 complete_command (char *arg, int from_tty)
265 char **completions, *point, *arg_prefix;
271 argpoint = strlen (arg);
273 /* complete_line assumes that its first argument is somewhere
274 within, and except for filenames at the beginning of, the word to
275 be completed. The following crude imitation of readline's
276 word-breaking tries to accomodate this. */
277 point = arg + argpoint;
280 if (strchr (rl_completer_word_break_characters, point[-1]) != 0)
285 arg_prefix = alloca (point - arg + 1);
286 memcpy (arg_prefix, arg, point - arg);
287 arg_prefix[point - arg] = 0;
289 completions = complete_line (point, arg, argpoint);
295 for (size = 0; completions[size]; ++size)
297 qsort (completions, size, sizeof (char *), compare_strings);
299 /* We do extra processing here since we only want to print each
306 printf_unfiltered ("%s%s\n", arg_prefix, completions[item]);
307 next_item = item + 1;
308 while (next_item < size
309 && ! strcmp (completions[item], completions[next_item]))
311 xfree (completions[next_item]);
315 xfree (completions[item]);
324 is_complete_command (struct cmd_list_element *c)
326 return cmd_cfunc_eq (c, complete_command);
330 show_version (char *args, int from_tty)
333 print_gdb_version (gdb_stdout);
334 printf_filtered ("\n");
338 /* Handle the quit command. */
341 quit_command (char *args, int from_tty)
343 if (!quit_confirm ())
344 error (_("Not confirmed."));
346 disconnect_tracing (from_tty);
348 quit_force (args, from_tty);
352 pwd_command (char *args, int from_tty)
355 error (_("The \"pwd\" command does not take an argument: %s"), args);
356 if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))
357 error (_("Error finding name of working directory: %s"),
358 safe_strerror (errno));
360 if (strcmp (gdb_dirbuf, current_directory) != 0)
361 printf_unfiltered (_("Working directory %s\n (canonically %s).\n"),
362 current_directory, gdb_dirbuf);
364 printf_unfiltered (_("Working directory %s.\n"), current_directory);
368 cd_command (char *dir, int from_tty)
371 /* Found something other than leading repetitions of "/..". */
375 /* If the new directory is absolute, repeat is a no-op; if relative,
376 repeat might be useful but is more likely to be a mistake. */
380 error_no_arg (_("new working directory"));
382 dir = tilde_expand (dir);
383 make_cleanup (xfree, dir);
386 perror_with_name (dir);
388 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
389 /* There's too much mess with DOSish names like "d:", "d:.",
390 "d:./foo" etc. Instead of having lots of special #ifdef'ed code,
391 simply get the canonicalized name of the current directory. */
392 dir = getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
396 if (IS_DIR_SEPARATOR (dir[len - 1]))
398 /* Remove the trailing slash unless this is a root directory
399 (including a drive letter on non-Unix systems). */
400 if (!(len == 1) /* "/" */
401 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
402 && !(len == 3 && dir[1] == ':') /* "d:/" */
408 dir = savestring (dir, len);
409 if (IS_ABSOLUTE_PATH (dir))
410 current_directory = dir;
413 if (IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1]))
414 current_directory = concat (current_directory, dir, (char *)NULL);
416 current_directory = concat (current_directory, SLASH_STRING,
421 /* Now simplify any occurrences of `.' and `..' in the pathname. */
424 for (p = current_directory; *p;)
426 if (IS_DIR_SEPARATOR (p[0]) && p[1] == '.'
427 && (p[2] == 0 || IS_DIR_SEPARATOR (p[2])))
429 else if (IS_DIR_SEPARATOR (p[0]) && p[1] == '.' && p[2] == '.'
430 && (p[3] == 0 || IS_DIR_SEPARATOR (p[3])))
434 /* Search backwards for the directory just before the "/.."
435 and obliterate it and the "/..". */
438 while (q != current_directory && !IS_DIR_SEPARATOR (q[-1]))
441 if (q == current_directory)
442 /* current_directory is
443 a relative pathname ("can't happen"--leave it alone). */
447 strcpy (q - 1, p + 3);
452 /* We are dealing with leading repetitions of "/..", for
453 example "/../..", which is the Mach super-root. */
463 forget_cached_source_info ();
466 pwd_command ((char *) 0, 1);
469 /* Show the current value of the 'script-extension' option. */
472 show_script_ext_mode (struct ui_file *file, int from_tty,
473 struct cmd_list_element *c, const char *value)
475 fprintf_filtered (file,
476 _("Script filename extension recognition is \"%s\".\n"),
480 /* Try to open SCRIPT_FILE.
481 If successful, the full path name is stored in *FULL_PATHP,
482 the stream is stored in *STREAMP, and return 1.
483 The caller is responsible for freeing *FULL_PATHP.
484 If not successful, return 0; errno is set for the last file
487 If SEARCH_PATH is non-zero, and the file isn't found in cwd,
488 search for it in the source search path.
490 NOTE: This calls openp which uses xfullpath to compute the full path
491 instead of gdb_realpath. Symbolic links are not resolved. */
494 find_and_open_script (const char *script_file, int search_path,
495 FILE **streamp, char **full_pathp)
499 struct cleanup *old_cleanups;
500 int search_flags = OPF_TRY_CWD_FIRST;
502 file = tilde_expand (script_file);
503 old_cleanups = make_cleanup (xfree, file);
506 search_flags |= OPF_SEARCH_IN_PATH;
508 /* Search for and open 'file' on the search path used for source
509 files. Put the full location in *FULL_PATHP. */
510 fd = openp (source_path, search_flags,
511 file, O_RDONLY, full_pathp);
515 int save_errno = errno;
516 do_cleanups (old_cleanups);
521 do_cleanups (old_cleanups);
523 *streamp = fdopen (fd, FOPEN_RT);
527 /* Load script FILE, which has already been opened as STREAM.
528 STREAM is closed before we return. */
531 source_script_from_stream (FILE *stream, const char *file)
533 if (script_ext_mode != script_ext_off
534 && strlen (file) > 3 && !strcmp (&file[strlen (file) - 3], ".py"))
536 volatile struct gdb_exception e;
538 TRY_CATCH (e, RETURN_MASK_ERROR)
540 /* The python support reopens the file using python functions,
541 so there's no point in passing STREAM here. */
542 source_python_script (file);
546 /* Should we fallback to ye olde GDB script mode? */
547 if (script_ext_mode == script_ext_soft
548 && e.reason == RETURN_ERROR && e.error == UNSUPPORTED_ERROR)
550 fseek (stream, 0, SEEK_SET);
551 script_from_file (stream, (char*) file);
555 /* Nope, just punt. */
564 script_from_file (stream, file);
567 /* Worker to perform the "source" command.
569 If SEARCH_PATH is non-zero, and the file isn't found in cwd,
570 search for it in the source search path. */
573 source_script_with_search (const char *file, int from_tty, int search_path)
577 struct cleanup *old_cleanups;
579 if (file == NULL || *file == 0)
580 error (_("source command requires file name of file to source."));
582 if (!find_and_open_script (file, search_path, &stream, &full_path))
584 /* The script wasn't found, or was otherwise inaccessible.
585 If the source command was invoked interactively, throw an
586 error. Otherwise (e.g. if it was invoked by a script),
587 silently ignore the error. */
589 perror_with_name (file);
594 old_cleanups = make_cleanup (xfree, full_path);
595 /* The python support reopens the file, so we need to pass full_path here
596 in case the file was found on the search path. It's useful to do this
597 anyway so that error messages show the actual file used. But only do
598 this if we (may have) used search_path, as printing the full path in
599 errors for the non-search case can be more noise than signal. */
600 source_script_from_stream (stream, search_path ? full_path : file);
601 do_cleanups (old_cleanups);
604 /* Wrapper around source_script_with_search to export it to main.c
605 for use in loading .gdbinit scripts. */
608 source_script (char *file, int from_tty)
610 source_script_with_search (file, from_tty, 0);
613 /* Return the source_verbose global variable to its previous state
614 on exit from the source command, by whatever means. */
616 source_verbose_cleanup (void *old_value)
618 source_verbose = *(int *)old_value;
623 source_command (char *args, int from_tty)
625 struct cleanup *old_cleanups;
627 int *old_source_verbose = xmalloc (sizeof(int));
630 *old_source_verbose = source_verbose;
631 old_cleanups = make_cleanup (source_verbose_cleanup,
634 /* -v causes the source command to run in verbose mode.
635 -s causes the file to be searched in the source search path,
636 even if the file name contains a '/'.
637 We still have to be able to handle filenames with spaces in a
638 backward compatible way, so buildargv is not appropriate. */
642 while (args[0] != '\0')
644 /* Make sure leading white space does not break the
646 while (isspace(args[0]))
652 if (args[1] == 'v' && isspace (args[2]))
656 /* Skip passed -v. */
659 else if (args[1] == 's' && isspace (args[2]))
663 /* Skip passed -s. */
670 while (isspace (args[0]))
675 source_script_with_search (file, from_tty, search_path);
677 do_cleanups (old_cleanups);
682 echo_command (char *text, int from_tty)
688 while ((c = *p++) != '\0')
692 /* \ at end of argument is used after spaces
693 so they won't be lost. */
697 c = parse_escape (get_current_arch (), &p);
699 printf_filtered ("%c", c);
702 printf_filtered ("%c", c);
705 /* Force this output to appear now. */
707 gdb_flush (gdb_stdout);
711 shell_escape (char *arg, int from_tty)
713 #if defined(CANT_FORK) || \
714 (!defined(HAVE_WORKING_VFORK) && !defined(HAVE_WORKING_FORK))
715 /* If ARG is NULL, they want an inferior shell, but `system' just
716 reports if the shell is available when passed a NULL arg. */
717 int rc = system (arg ? arg : "");
720 arg = "inferior shell";
724 fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", arg,
725 safe_strerror (errno));
726 gdb_flush (gdb_stderr);
730 fprintf_unfiltered (gdb_stderr, "%s exited with status %d\n", arg, rc);
731 gdb_flush (gdb_stderr);
734 /* Make sure to return to the directory GDB thinks it is, in case
735 the shell command we just ran changed it. */
736 chdir (current_directory);
738 #else /* Can fork. */
741 if ((pid = vfork ()) == 0)
743 const char *p, *user_shell;
745 if ((user_shell = (char *) getenv ("SHELL")) == NULL)
746 user_shell = "/bin/sh";
748 /* Get the name of the shell for arg0. */
749 p = lbasename (user_shell);
752 execl (user_shell, p, (char *) 0);
754 execl (user_shell, p, "-c", arg, (char *) 0);
756 fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", user_shell,
757 safe_strerror (errno));
758 gdb_flush (gdb_stderr);
763 waitpid (pid, &status, 0);
765 error (_("Fork failed"));
766 #endif /* Can fork. */
770 edit_command (char *arg, int from_tty)
772 struct symtabs_and_lines sals;
773 struct symtab_and_line sal;
779 /* Pull in the current default source line if necessary. */
782 set_default_source_symtab_and_line ();
783 sal = get_current_source_symtab_and_line ();
786 /* Bare "edit" edits file with present line. */
791 error (_("No default source file yet."));
792 sal.line += get_lines_to_list () / 2;
796 /* Now should only be one argument -- decode it in SAL. */
799 sals = decode_line_1 (&arg1, 0, 0, 0, 0);
808 ambiguous_line_spec (&sals);
817 error (_("Junk at end of line specification."));
819 /* If line was specified by address, first print exactly which
820 line, and which file. In this case, sal.symtab == 0 means
821 address is outside of all known source files, not that user
822 failed to give a filename. */
825 struct gdbarch *gdbarch;
828 /* FIXME-32x64--assumes sal.pc fits in long. */
829 error (_("No source file for address %s."),
830 hex_string ((unsigned long) sal.pc));
832 gdbarch = get_objfile_arch (sal.symtab->objfile);
833 sym = find_pc_function (sal.pc);
835 printf_filtered ("%s is in %s (%s:%d).\n",
836 paddress (gdbarch, sal.pc),
837 SYMBOL_PRINT_NAME (sym),
838 sal.symtab->filename, sal.line);
840 printf_filtered ("%s is at %s:%d.\n",
841 paddress (gdbarch, sal.pc),
842 sal.symtab->filename, sal.line);
845 /* If what was given does not imply a symtab, it must be an
846 undebuggable symbol which means no source code. */
849 error (_("No line number known for %s."), arg);
852 if ((editor = (char *) getenv ("EDITOR")) == NULL)
855 /* If we don't already know the full absolute file name of the
856 source file, find it now. */
857 if (!sal.symtab->fullname)
859 fn = symtab_to_fullname (sal.symtab);
864 fn = sal.symtab->fullname;
866 /* Quote the file name, in case it has whitespace or other special
868 p = xstrprintf ("%s +%d \"%s\"", editor, sal.line, fn);
869 shell_escape (p, from_tty);
874 list_command (char *arg, int from_tty)
876 struct symtabs_and_lines sals, sals_end;
877 struct symtab_and_line sal = { 0 };
878 struct symtab_and_line sal_end = { 0 };
879 struct symtab_and_line cursal = { 0 };
888 /* Pull in the current default source line if necessary. */
889 if (arg == 0 || arg[0] == '+' || arg[0] == '-')
891 set_default_source_symtab_and_line ();
892 cursal = get_current_source_symtab_and_line ();
895 /* "l" or "l +" lists next ten lines. */
897 if (arg == 0 || strcmp (arg, "+") == 0)
899 print_source_lines (cursal.symtab, cursal.line,
900 cursal.line + get_lines_to_list (), 0);
904 /* "l -" lists previous ten lines, the ones before the ten just
906 if (strcmp (arg, "-") == 0)
908 print_source_lines (cursal.symtab,
909 max (get_first_line_listed ()
910 - get_lines_to_list (), 1),
911 get_first_line_listed (), 0);
915 /* Now if there is only one argument, decode it in SAL
917 If there are two arguments, decode them in SAL and SAL_END
918 and clear NO_END; however, if one of the arguments is blank,
919 set DUMMY_BEG or DUMMY_END to record that fact. */
921 if (!have_full_symbols () && !have_partial_symbols ())
922 error (_("No symbol table is loaded. Use the \"file\" command."));
929 sals = decode_line_1 (&arg1, 0, 0, 0, 0);
935 ambiguous_line_spec (&sals);
944 /* Record whether the BEG arg is all digits. */
946 for (p = arg; p != arg1 && *p >= '0' && *p <= '9'; p++);
947 linenum_beg = (p == arg1);
949 while (*arg1 == ' ' || *arg1 == '\t')
955 while (*arg1 == ' ' || *arg1 == '\t')
962 sals_end = decode_line_1 (&arg1, 0, 0, 0, 0);
964 sals_end = decode_line_1 (&arg1, 0, sal.symtab, sal.line, 0);
965 if (sals_end.nelts == 0)
967 if (sals_end.nelts > 1)
969 ambiguous_line_spec (&sals_end);
970 xfree (sals_end.sals);
973 sal_end = sals_end.sals[0];
974 xfree (sals_end.sals);
979 error (_("Junk at end of line specification."));
981 if (!no_end && !dummy_beg && !dummy_end
982 && sal.symtab != sal_end.symtab)
983 error (_("Specified start and end are in different files."));
984 if (dummy_beg && dummy_end)
985 error (_("Two empty args do not say what lines to list."));
987 /* If line was specified by address,
988 first print exactly which line, and which file.
990 In this case, sal.symtab == 0 means address is outside of all
991 known source files, not that user failed to give a filename. */
994 struct gdbarch *gdbarch;
997 /* FIXME-32x64--assumes sal.pc fits in long. */
998 error (_("No source file for address %s."),
999 hex_string ((unsigned long) sal.pc));
1001 gdbarch = get_objfile_arch (sal.symtab->objfile);
1002 sym = find_pc_function (sal.pc);
1004 printf_filtered ("%s is in %s (%s:%d).\n",
1005 paddress (gdbarch, sal.pc),
1006 SYMBOL_PRINT_NAME (sym),
1007 sal.symtab->filename, sal.line);
1009 printf_filtered ("%s is at %s:%d.\n",
1010 paddress (gdbarch, sal.pc),
1011 sal.symtab->filename, sal.line);
1014 /* If line was not specified by just a line number, and it does not
1015 imply a symtab, it must be an undebuggable symbol which means no
1018 if (!linenum_beg && sal.symtab == 0)
1019 error (_("No line number known for %s."), arg);
1021 /* If this command is repeated with RET,
1022 turn it into the no-arg variant. */
1027 if (dummy_beg && sal_end.symtab == 0)
1028 error (_("No default source file yet. Do \"help list\"."));
1030 print_source_lines (sal_end.symtab,
1031 max (sal_end.line - (get_lines_to_list () - 1), 1),
1032 sal_end.line + 1, 0);
1033 else if (sal.symtab == 0)
1034 error (_("No default source file yet. Do \"help list\"."));
1037 int first_line = sal.line - get_lines_to_list () / 2;
1039 if (first_line < 1) first_line = 1;
1041 print_source_lines (sal.symtab,
1043 first_line + get_lines_to_list (),
1047 print_source_lines (sal.symtab, sal.line,
1049 ? sal.line + get_lines_to_list ()
1050 : sal_end.line + 1),
1054 /* Subroutine of disassemble_command to simplify it.
1055 Perform the disassembly.
1056 NAME is the name of the function if known, or NULL.
1057 [LOW,HIGH) are the range of addresses to disassemble.
1058 MIXED is non-zero to print source with the assembler. */
1061 print_disassembly (struct gdbarch *gdbarch, const char *name,
1062 CORE_ADDR low, CORE_ADDR high, int flags)
1065 if (!tui_is_window_visible (DISASSEM_WIN))
1068 printf_filtered ("Dump of assembler code ");
1070 printf_filtered ("for function %s:\n", name);
1072 printf_filtered ("from %s to %s:\n",
1073 paddress (gdbarch, low), paddress (gdbarch, high));
1075 /* Dump the specified range. */
1076 gdb_disassembly (gdbarch, current_uiout, 0, flags, -1, low, high);
1078 printf_filtered ("End of assembler dump.\n");
1079 gdb_flush (gdb_stdout);
1084 tui_show_assembly (gdbarch, low);
1089 /* Subroutine of disassemble_command to simplify it.
1090 Print a disassembly of the current function according to FLAGS. */
1093 disassemble_current_function (int flags)
1095 struct frame_info *frame;
1096 struct gdbarch *gdbarch;
1097 CORE_ADDR low, high, pc;
1100 frame = get_selected_frame (_("No frame selected."));
1101 gdbarch = get_frame_arch (frame);
1102 pc = get_frame_pc (frame);
1103 if (find_pc_partial_function (pc, &name, &low, &high) == 0)
1104 error (_("No function contains program counter for selected frame."));
1106 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1109 /* FIXME: cagney/2004-02-07: This should be an observer. */
1110 low = tui_get_low_disassembly_address (gdbarch, low, pc);
1112 low += gdbarch_deprecated_function_start_offset (gdbarch);
1114 print_disassembly (gdbarch, name, low, high, flags);
1117 /* Dump a specified section of assembly code.
1121 - dump the assembly code for the function of the current pc
1122 disassemble [/mr] addr
1123 - dump the assembly code for the function at ADDR
1124 disassemble [/mr] low,high
1125 disassemble [/mr] low,+length
1126 - dump the assembly code in the range [LOW,HIGH), or [LOW,LOW+length)
1128 A /m modifier will include source code with the assembly.
1129 A /r modifier will include raw instructions in hex with the assembly. */
1132 disassemble_command (char *arg, int from_tty)
1134 struct gdbarch *gdbarch = get_current_arch ();
1135 CORE_ADDR low, high;
1143 if (arg && *arg == '/')
1148 error (_("Missing modifier."));
1150 while (*arg && ! isspace (*arg))
1155 flags |= DISASSEMBLY_SOURCE;
1158 flags |= DISASSEMBLY_RAW_INSN;
1161 error (_("Invalid disassembly modifier."));
1165 while (isspace (*arg))
1169 if (! arg || ! *arg)
1171 flags |= DISASSEMBLY_OMIT_FNAME;
1172 disassemble_current_function (flags);
1176 pc = value_as_address (parse_to_comma_and_eval (&arg));
1182 if (find_pc_partial_function (pc, &name, &low, &high) == 0)
1183 error (_("No function contains specified address."));
1185 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1188 /* FIXME: cagney/2004-02-07: This should be an observer. */
1189 low = tui_get_low_disassembly_address (gdbarch, low, pc);
1191 low += gdbarch_deprecated_function_start_offset (gdbarch);
1192 flags |= DISASSEMBLY_OMIT_FNAME;
1196 /* Two arguments. */
1199 while (isspace (*arg))
1206 high = parse_and_eval_address (arg);
1211 print_disassembly (gdbarch, name, low, high, flags);
1215 make_command (char *arg, int from_tty)
1223 p = xmalloc (sizeof ("make ") + strlen (arg));
1224 strcpy (p, "make ");
1225 strcpy (p + sizeof ("make ") - 1, arg);
1228 shell_escape (p, from_tty);
1232 show_user (char *args, int from_tty)
1234 struct cmd_list_element *c;
1235 extern struct cmd_list_element *cmdlist;
1239 char *comname = args;
1241 c = lookup_cmd (&comname, cmdlist, "", 0, 1);
1242 if (c->class != class_user)
1243 error (_("Not a user command."));
1244 show_user_1 (c, "", args, gdb_stdout);
1248 for (c = cmdlist; c; c = c->next)
1250 if (c->class == class_user || c->prefixlist != NULL)
1251 show_user_1 (c, "", c->name, gdb_stdout);
1256 /* Search through names of commands and documentations for a certain
1257 regular expression. */
1260 apropos_command (char *searchstr, int from_tty)
1265 if (searchstr == NULL)
1266 error (_("REGEXP string is empty"));
1268 code = regcomp (&pattern, searchstr, REG_ICASE);
1271 struct cleanup *cleanups;
1273 cleanups = make_regfree_cleanup (&pattern);
1274 apropos_cmd (gdb_stdout, cmdlist, &pattern, "");
1275 do_cleanups (cleanups);
1279 char *err = get_regcomp_error (code, &pattern);
1281 make_cleanup (xfree, err);
1282 error (_("Error in regular expression: %s"), err);
1286 /* Subroutine of alias_command to simplify it.
1287 Return the first N elements of ARGV flattened back to a string
1288 with a space separating each element.
1289 ARGV may not be NULL.
1290 This does not take care of quoting elements in case they contain spaces
1294 argv_to_dyn_string (char **argv, int n)
1297 dyn_string_t result = dyn_string_new (10);
1299 gdb_assert (argv != NULL);
1300 gdb_assert (n >= 0 && n <= countargv (argv));
1302 for (i = 0; i < n; ++i)
1305 dyn_string_append_char (result, ' ');
1306 dyn_string_append_cstr (result, argv[i]);
1312 /* Subroutine of alias_command to simplify it.
1313 Return TRUE if COMMAND exists, unambiguously. Otherwise FALSE. */
1316 valid_command_p (char *command)
1318 struct cmd_list_element *c;
1320 c = lookup_cmd_1 (& command, cmdlist, NULL, 1);
1322 if (c == NULL || c == (struct cmd_list_element *) -1)
1325 /* This is the slightly tricky part.
1326 lookup_cmd_1 will return a pointer to the last part of COMMAND
1327 to match, leaving COMMAND pointing at the remainder. */
1328 while (*command == ' ' || *command == '\t')
1330 return *command == '\0';
1333 /* Make an alias of an existing command. */
1336 alias_command (char *args, int from_tty)
1338 int i, alias_argc, command_argc;
1339 int abbrev_flag = 0;
1340 char *args2, *equals, *alias, *command;
1341 char **alias_argv, **command_argv;
1342 dyn_string_t alias_dyn_string, command_dyn_string;
1343 struct cmd_list_element *c;
1344 static const char usage[] = N_("Usage: alias [-a] [--] ALIAS = COMMAND");
1346 if (args == NULL || strchr (args, '=') == NULL)
1349 args2 = xstrdup (args);
1350 make_cleanup (xfree, args2);
1351 equals = strchr (args2, '=');
1353 alias_argv = gdb_buildargv (args2);
1354 make_cleanup_freeargv (alias_argv);
1355 command_argv = gdb_buildargv (equals + 1);
1356 make_cleanup_freeargv (command_argv);
1358 for (i = 0; alias_argv[i] != NULL; )
1360 if (strcmp (alias_argv[i], "-a") == 0)
1365 else if (strcmp (alias_argv[i], "--") == 0)
1374 if (alias_argv[0] == NULL || command_argv[0] == NULL
1375 || *alias_argv[0] == '\0' || *command_argv[0] == '\0')
1378 for (i = 0; alias_argv[i] != NULL; ++i)
1380 if (! valid_user_defined_cmd_name_p (alias_argv[i]))
1383 error (_("Invalid command name: %s"), alias_argv[i]);
1385 error (_("Invalid command element name: %s"), alias_argv[i]);
1389 alias_argc = countargv (alias_argv);
1390 command_argc = countargv (command_argv);
1392 /* COMMAND must exist.
1393 Reconstruct the command to remove any extraneous spaces,
1394 for better error messages. */
1395 command_dyn_string = argv_to_dyn_string (command_argv, command_argc);
1396 make_cleanup_dyn_string_delete (command_dyn_string);
1397 command = dyn_string_buf (command_dyn_string);
1398 if (! valid_command_p (command))
1399 error (_("Invalid command to alias to: %s"), command);
1401 /* ALIAS must not exist. */
1402 alias_dyn_string = argv_to_dyn_string (alias_argv, alias_argc);
1403 make_cleanup_dyn_string_delete (alias_dyn_string);
1404 alias = dyn_string_buf (alias_dyn_string);
1405 if (valid_command_p (alias))
1406 error (_("Alias already exists: %s"), alias);
1408 /* If ALIAS is one word, it is an alias for the entire COMMAND.
1409 Example: alias spe = set print elements
1411 Otherwise ALIAS and COMMAND must have the same number of words,
1412 and every word except the last must match; and the last word of
1413 ALIAS is made an alias of the last word of COMMAND.
1414 Example: alias set print elms = set pr elem
1415 Note that unambiguous abbreviations are allowed. */
1417 if (alias_argc == 1)
1419 /* add_cmd requires *we* allocate space for name, hence the xstrdup. */
1420 add_com_alias (xstrdup (alias_argv[0]), command, class_alias,
1426 dyn_string_t alias_prefix_dyn_string, command_prefix_dyn_string;
1427 char *alias_prefix, *command_prefix;
1428 struct cmd_list_element *c_alias, *c_command;
1430 if (alias_argc != command_argc)
1431 error (_("Mismatched command length between ALIAS and COMMAND."));
1433 /* Create copies of ALIAS and COMMAND without the last word,
1434 and use that to verify the leading elements match. */
1435 alias_prefix_dyn_string =
1436 argv_to_dyn_string (alias_argv, alias_argc - 1);
1437 make_cleanup_dyn_string_delete (alias_prefix_dyn_string);
1438 command_prefix_dyn_string =
1439 argv_to_dyn_string (alias_argv, command_argc - 1);
1440 make_cleanup_dyn_string_delete (command_prefix_dyn_string);
1441 alias_prefix = dyn_string_buf (alias_prefix_dyn_string);
1442 command_prefix = dyn_string_buf (command_prefix_dyn_string);
1444 c_command = lookup_cmd_1 (& command_prefix, cmdlist, NULL, 1);
1445 /* We've already tried to look up COMMAND. */
1446 gdb_assert (c_command != NULL
1447 && c_command != (struct cmd_list_element *) -1);
1448 gdb_assert (c_command->prefixlist != NULL);
1449 c_alias = lookup_cmd_1 (& alias_prefix, cmdlist, NULL, 1);
1450 if (c_alias != c_command)
1451 error (_("ALIAS and COMMAND prefixes do not match."));
1453 /* add_cmd requires *we* allocate space for name, hence the xstrdup. */
1454 add_alias_cmd (xstrdup (alias_argv[alias_argc - 1]),
1455 command_argv[command_argc - 1],
1456 class_alias, abbrev_flag, c_command->prefixlist);
1460 /* Print a list of files and line numbers which a user may choose from
1461 in order to list a function which was specified ambiguously (as
1462 with `list classname::overloadedfuncname', for example). The
1463 vector in SALS provides the filenames and line numbers. */
1466 ambiguous_line_spec (struct symtabs_and_lines *sals)
1470 for (i = 0; i < sals->nelts; ++i)
1471 printf_filtered (_("file: \"%s\", line number: %d\n"),
1472 sals->sals[i].symtab->filename, sals->sals[i].line);
1476 set_debug (char *arg, int from_tty)
1478 printf_unfiltered (_("\"set debug\" must be followed by "
1479 "the name of a debug subcommand.\n"));
1480 help_list (setdebuglist, "set debug ", -1, gdb_stdout);
1484 show_debug (char *args, int from_tty)
1486 cmd_show_list (showdebuglist, from_tty, "");
1490 init_cmd_lists (void)
1492 max_user_call_depth = 1024;
1502 enablebreaklist = NULL;
1507 showhistlist = NULL;
1508 unsethistlist = NULL;
1509 maintenancelist = NULL;
1510 maintenanceinfolist = NULL;
1511 maintenanceprintlist = NULL;
1512 setprintlist = NULL;
1513 showprintlist = NULL;
1514 setchecklist = NULL;
1515 showchecklist = NULL;
1520 show_info_verbose (struct ui_file *file, int from_tty,
1521 struct cmd_list_element *c,
1525 fprintf_filtered (file,
1526 _("Verbose printing of informational messages is %s.\n"),
1529 fprintf_filtered (file, _("Verbosity is %s.\n"), value);
1533 show_history_expansion_p (struct ui_file *file, int from_tty,
1534 struct cmd_list_element *c, const char *value)
1536 fprintf_filtered (file, _("History expansion on command input is %s.\n"),
1541 show_baud_rate (struct ui_file *file, int from_tty,
1542 struct cmd_list_element *c, const char *value)
1544 fprintf_filtered (file, _("Baud rate for remote serial I/O is %s.\n"),
1549 show_remote_debug (struct ui_file *file, int from_tty,
1550 struct cmd_list_element *c, const char *value)
1552 fprintf_filtered (file, _("Debugging of remote protocol is %s.\n"),
1557 show_remote_timeout (struct ui_file *file, int from_tty,
1558 struct cmd_list_element *c, const char *value)
1560 fprintf_filtered (file,
1561 _("Timeout limit to wait for target to respond is %s.\n"),
1566 show_max_user_call_depth (struct ui_file *file, int from_tty,
1567 struct cmd_list_element *c, const char *value)
1569 fprintf_filtered (file,
1570 _("The max call depth for user-defined commands is %s.\n"),
1576 init_cli_cmds (void)
1578 struct cmd_list_element *c;
1579 char *source_help_text;
1581 /* Define the classes of commands.
1582 They will appear in the help list in alphabetical order. */
1584 add_cmd ("internals", class_maintenance, NULL, _("\
1585 Maintenance commands.\n\
1586 Some gdb commands are provided just for use by gdb maintainers.\n\
1587 These commands are subject to frequent change, and may not be as\n\
1588 well documented as user commands."),
1590 add_cmd ("obscure", class_obscure, NULL, _("Obscure features."), &cmdlist);
1591 add_cmd ("aliases", class_alias, NULL,
1592 _("Aliases of other commands."), &cmdlist);
1593 add_cmd ("user-defined", class_user, NULL, _("\
1594 User-defined commands.\n\
1595 The commands in this class are those defined by the user.\n\
1596 Use the \"define\" command to define a command."), &cmdlist);
1597 add_cmd ("support", class_support, NULL, _("Support facilities."), &cmdlist);
1599 add_cmd ("status", class_info, NULL, _("Status inquiries."), &cmdlist);
1600 add_cmd ("files", class_files, NULL, _("Specifying and examining files."),
1602 add_cmd ("breakpoints", class_breakpoint, NULL,
1603 _("Making program stop at certain points."), &cmdlist);
1604 add_cmd ("data", class_vars, NULL, _("Examining data."), &cmdlist);
1605 add_cmd ("stack", class_stack, NULL, _("\
1606 Examining the stack.\n\
1607 The stack is made up of stack frames. Gdb assigns numbers to stack frames\n\
1608 counting from zero for the innermost (currently executing) frame.\n\n\
1609 At any time gdb identifies one frame as the \"selected\" frame.\n\
1610 Variable lookups are done with respect to the selected frame.\n\
1611 When the program being debugged stops, gdb selects the innermost frame.\n\
1612 The commands below can be used to select other frames by number or address."),
1614 add_cmd ("running", class_run, NULL, _("Running the program."), &cmdlist);
1616 /* Define general commands. */
1618 add_com ("pwd", class_files, pwd_command, _("\
1619 Print working directory. This is used for your program as well."));
1621 c = add_cmd ("cd", class_files, cd_command, _("\
1622 Set working directory to DIR for debugger and program being debugged.\n\
1623 The change does not take effect for the program being debugged\n\
1624 until the next time it is started."), &cmdlist);
1625 set_cmd_completer (c, filename_completer);
1627 add_com ("echo", class_support, echo_command, _("\
1628 Print a constant string. Give string as argument.\n\
1629 C escape sequences may be used in the argument.\n\
1630 No newline is added at the end of the argument;\n\
1631 use \"\\n\" if you want a newline to be printed.\n\
1632 Since leading and trailing whitespace are ignored in command arguments,\n\
1633 if you want to print some you must use \"\\\" before leading whitespace\n\
1634 to be printed or after trailing whitespace."));
1635 add_com ("document", class_support, document_command, _("\
1636 Document a user-defined command.\n\
1637 Give command name as argument. Give documentation on following lines.\n\
1638 End with a line of just \"end\"."));
1639 add_com ("define", class_support, define_command, _("\
1640 Define a new command name. Command name is argument.\n\
1641 Definition appears on following lines, one command per line.\n\
1642 End with a line of just \"end\".\n\
1643 Use the \"document\" command to give documentation for the new command.\n\
1644 Commands defined in this way may have up to ten arguments."));
1646 source_help_text = xstrprintf (_("\
1647 Read commands from a file named FILE.\n\
1649 Usage: source [-s] [-v] FILE\n\
1650 -s: search for the script in the source search path,\n\
1651 even if FILE contains directories.\n\
1652 -v: each command in FILE is echoed as it is executed.\n\
1654 Note that the file \"%s\" is read automatically in this way\n\
1655 when GDB is started."), gdbinit);
1656 c = add_cmd ("source", class_support, source_command,
1657 source_help_text, &cmdlist);
1658 set_cmd_completer (c, filename_completer);
1660 add_setshow_enum_cmd ("script-extension", class_support,
1661 script_ext_enums, &script_ext_mode, _("\
1662 Set mode for script filename extension recognition."), _("\
1663 Show mode for script filename extension recognition."), _("\
1664 off == no filename extension recognition (all sourced files are GDB scripts)\n\
1665 soft == evaluate script according to filename extension, fallback to GDB script"
1667 strict == evaluate script according to filename extension, error if not supported"
1670 show_script_ext_mode,
1671 &setlist, &showlist);
1673 add_com ("quit", class_support, quit_command, _("Exit gdb."));
1674 c = add_com ("help", class_support, help_command,
1675 _("Print list of commands."));
1676 set_cmd_completer (c, command_completer);
1677 add_com_alias ("q", "quit", class_support, 1);
1678 add_com_alias ("h", "help", class_support, 1);
1680 add_setshow_boolean_cmd ("verbose", class_support, &info_verbose, _("\
1681 Set verbosity."), _("\
1682 Show verbosity."), NULL,
1685 &setlist, &showlist);
1687 add_prefix_cmd ("history", class_support, set_history,
1688 _("Generic command for setting command history parameters."),
1689 &sethistlist, "set history ", 0, &setlist);
1690 add_prefix_cmd ("history", class_support, show_history,
1691 _("Generic command for showing command history parameters."),
1692 &showhistlist, "show history ", 0, &showlist);
1694 add_setshow_boolean_cmd ("expansion", no_class, &history_expansion_p, _("\
1695 Set history expansion on command input."), _("\
1696 Show history expansion on command input."), _("\
1697 Without an argument, history expansion is enabled."),
1699 show_history_expansion_p,
1700 &sethistlist, &showhistlist);
1702 add_prefix_cmd ("info", class_info, info_command, _("\
1703 Generic command for showing things about the program being debugged."),
1704 &infolist, "info ", 0, &cmdlist);
1705 add_com_alias ("i", "info", class_info, 1);
1706 add_com_alias ("inf", "info", class_info, 1);
1708 add_com ("complete", class_obscure, complete_command,
1709 _("List the completions for the rest of the line as a command."));
1711 add_prefix_cmd ("show", class_info, show_command, _("\
1712 Generic command for showing things about the debugger."),
1713 &showlist, "show ", 0, &cmdlist);
1714 /* Another way to get at the same thing. */
1715 add_info ("set", show_command, _("Show all GDB settings."));
1717 add_cmd ("commands", no_set_class, show_commands, _("\
1718 Show the history of commands you typed.\n\
1719 You can supply a command number to start with, or a `+' to start after\n\
1720 the previous command number shown."),
1723 add_cmd ("version", no_set_class, show_version,
1724 _("Show what version of GDB this is."), &showlist);
1726 add_com ("while", class_support, while_command, _("\
1727 Execute nested commands WHILE the conditional expression is non zero.\n\
1728 The conditional expression must follow the word `while' and must in turn be\n\
1729 followed by a new line. The nested commands must be entered one per line,\n\
1730 and should be terminated by the word `end'."));
1732 add_com ("if", class_support, if_command, _("\
1733 Execute nested commands once IF the conditional expression is non zero.\n\
1734 The conditional expression must follow the word `if' and must in turn be\n\
1735 followed by a new line. The nested commands must be entered one per line,\n\
1736 and should be terminated by the word 'else' or `end'. If an else clause\n\
1737 is used, the same rules apply to its nested commands as to the first ones."));
1739 /* If target is open when baud changes, it doesn't take effect until
1740 the next open (I think, not sure). */
1741 add_setshow_zinteger_cmd ("remotebaud", no_class, &baud_rate, _("\
1742 Set baud rate for remote serial I/O."), _("\
1743 Show baud rate for remote serial I/O."), _("\
1744 This value is used to set the speed of the serial port when debugging\n\
1745 using remote targets."),
1748 &setlist, &showlist);
1750 add_setshow_zinteger_cmd ("remote", no_class, &remote_debug, _("\
1751 Set debugging of remote protocol."), _("\
1752 Show debugging of remote protocol."), _("\
1753 When enabled, each packet sent or received with the remote target\n\
1757 &setdebuglist, &showdebuglist);
1759 add_setshow_integer_cmd ("remotetimeout", no_class, &remote_timeout, _("\
1760 Set timeout limit to wait for target to respond."), _("\
1761 Show timeout limit to wait for target to respond."), _("\
1762 This value is used to set the time limit for gdb to wait for a response\n\
1765 show_remote_timeout,
1766 &setlist, &showlist);
1768 add_prefix_cmd ("debug", no_class, set_debug,
1769 _("Generic command for setting gdb debugging flags"),
1770 &setdebuglist, "set debug ", 0, &setlist);
1772 add_prefix_cmd ("debug", no_class, show_debug,
1773 _("Generic command for showing gdb debugging flags"),
1774 &showdebuglist, "show debug ", 0, &showlist);
1776 c = add_com ("shell", class_support, shell_escape, _("\
1777 Execute the rest of the line as a shell command.\n\
1778 With no arguments, run an inferior shell."));
1779 set_cmd_completer (c, filename_completer);
1781 c = add_com ("edit", class_files, edit_command, _("\
1782 Edit specified file or function.\n\
1783 With no argument, edits file containing most recent line listed.\n\
1784 Editing targets can be specified in these ways:\n\
1785 FILE:LINENUM, to edit at that line in that file,\n\
1786 FUNCTION, to edit at the beginning of that function,\n\
1787 FILE:FUNCTION, to distinguish among like-named static functions.\n\
1788 *ADDRESS, to edit at the line containing that address.\n\
1789 Uses EDITOR environment variable contents as editor (or ex as default)."));
1791 c->completer = location_completer;
1793 add_com ("list", class_files, list_command, _("\
1794 List specified function or line.\n\
1795 With no argument, lists ten more lines after or around previous listing.\n\
1796 \"list -\" lists the ten lines before a previous ten-line listing.\n\
1797 One argument specifies a line, and ten lines are listed around that line.\n\
1798 Two arguments with comma between specify starting and ending lines to list.\n\
1799 Lines can be specified in these ways:\n\
1800 LINENUM, to list around that line in current file,\n\
1801 FILE:LINENUM, to list around that line in that file,\n\
1802 FUNCTION, to list around beginning of that function,\n\
1803 FILE:FUNCTION, to distinguish among like-named static functions.\n\
1804 *ADDRESS, to list around the line containing that address.\n\
1805 With two args if one is empty it stands for ten lines away from \
1809 add_com_alias ("l", "list", class_files, 1);
1811 add_com_alias ("v", "list", class_files, 1);
1814 add_com_alias ("file", "list", class_files, 1);
1816 c = add_com ("disassemble", class_vars, disassemble_command, _("\
1817 Disassemble a specified section of memory.\n\
1818 Default is the function surrounding the pc of the selected frame.\n\
1819 With a /m modifier, source lines are included (if available).\n\
1820 With a /r modifier, raw instructions in hex are included.\n\
1821 With a single argument, the function surrounding that address is dumped.\n\
1822 Two arguments (separated by a comma) are taken as a range of memory to dump,\n\
1823 in the form of \"start,end\", or \"start,+length\"."));
1824 set_cmd_completer (c, location_completer);
1826 add_com_alias ("va", "disassemble", class_xdb, 0);
1828 add_com_alias ("!", "shell", class_support, 0);
1830 c = add_com ("make", class_support, make_command, _("\
1831 Run the ``make'' program using the rest of the line as arguments."));
1832 set_cmd_completer (c, filename_completer);
1833 add_cmd ("user", no_class, show_user, _("\
1834 Show definitions of user defined commands.\n\
1835 Argument is the name of the user defined command.\n\
1836 With no argument, show definitions of all user defined commands."), &showlist);
1837 add_com ("apropos", class_support, apropos_command,
1838 _("Search for commands matching a REGEXP"));
1840 add_setshow_integer_cmd ("max-user-call-depth", no_class,
1841 &max_user_call_depth, _("\
1842 Set the max call depth for user-defined commands."), _("\
1843 Show the max call depth for user-defined commands."), NULL,
1845 show_max_user_call_depth,
1846 &setlist, &showlist);
1848 add_setshow_boolean_cmd ("trace-commands", no_class, &trace_commands, _("\
1849 Set tracing of GDB CLI commands."), _("\
1850 Show state of GDB CLI command tracing."), _("\
1851 When 'on', each command is displayed as it is executed."),
1854 &setlist, &showlist);
1856 c = add_com ("alias", class_support, alias_command, _("\
1857 Define a new command that is an alias of an existing command.\n\
1858 Usage: alias [-a] [--] ALIAS = COMMAND\n\
1859 ALIAS is the name of the alias command to create.\n\
1860 COMMAND is the command being aliased to.\n\
1861 If \"-a\" is specified, the command is an abbreviation,\n\
1862 and will not appear in help command list output.\n\
1865 Make \"spe\" an alias of \"set print elements\":\n\
1866 alias spe = set print elements\n\
1867 Make \"elms\" an alias of \"elements\" in the \"set print\" command:\n\
1868 alias -a set print elms = set print elements"));