1 .\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.35.
2 .TH EXPR "1" "March 2007" "GNU coreutils 6.9" "User Commands"
4 expr \- evaluate expressions
12 .\" Add any additional description here
15 display this help and exit
18 output version information and exit
20 Print the value of EXPRESSION to standard output. A blank line below
21 separates increasing precedence groups. EXPRESSION may be:
24 ARG1 if it is neither null nor 0, otherwise ARG2
27 ARG1 if neither argument is null or 0, otherwise 0
30 ARG1 is less than ARG2
33 ARG1 is less than or equal to ARG2
39 ARG1 is unequal to ARG2
42 ARG1 is greater than or equal to ARG2
45 ARG1 is greater than ARG2
48 arithmetic sum of ARG1 and ARG2
51 arithmetic difference of ARG1 and ARG2
54 arithmetic product of ARG1 and ARG2
57 arithmetic quotient of ARG1 divided by ARG2
60 arithmetic remainder of ARG1 divided by ARG2
63 anchored pattern match of REGEXP in STRING
66 same as STRING : REGEXP
68 substr STRING POS LENGTH
69 substring of STRING, POS counted from 1
72 index in STRING where any CHARS is found, or 0
78 interpret TOKEN as a string, even if it is a
80 keyword like `match' or an operator like `/'
85 Beware that many operators need to be escaped or quoted for shells.
86 Comparisons are arithmetic if both ARGs are numbers, else lexicographical.
87 Pattern matches return the string matched between \e( and \e) or null; if
88 \e( and \e) are not used, they return the number of characters matched or 0.
90 Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null
91 or 0, 2 if EXPRESSION is syntactically invalid, and 3 if an error occurred.
93 Written by Mike Parker.
95 Report bugs to <bug\-coreutils@gnu.org>.
97 Copyright \(co 2007 Free Software Foundation, Inc.
99 This is free software. You may redistribute copies of it under the terms of
100 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
101 There is NO WARRANTY, to the extent permitted by law.
103 The full documentation for
105 is maintained as a Texinfo manual. If the
109 programs are properly installed at your site, the command
113 should give you access to the complete manual.