Mnemonic: value of B<-D> switch.
=item ${^ENCODING}
-X<$^ENCODING>
+X<${^ENCODING}>
The I<object reference> to the C<Encode> object that is used to convert
the source code to Unicode. Thanks to this variable your Perl script
if not in package main when running under C<strict 'vars'>.
=item $^H
+X<$^H>
WARNING: This variable is strictly for internal use only. Its availability,
behavior, and contents are subject to change without notice.
This variable was added in Perl 5.003.
=item %^H
+X<%^H>
The C<%^H> hash provides the same scoping semantic as C<$^H>. This makes it
useful for implementation of lexically scoped pragmas. See L<perlpragma>.
This variable was added in Perl 5.003.
=item ${^OPEN}
+X<${^OPEN}>
An internal variable used by PerlIO. A string in two parts, separated
by a C<\0> byte, the first part describes the input layers, the second
See also L<perldebguts>.
=item %SIG
-
-=item $SIG{expr}
X<%SIG>
The hash C<%SIG> contains signal handlers for signals. For example:
and B<-C> filetests are based on this value.
=item ${^TAINT}
+X<${^TAINT}>
Reflects if taint mode is on or off. 1 for on (the program was run with
B<-T>), 0 for off, -1 when only taint warnings are enabled (i.e. with
This variable was added in Perl 5.8.
=item ${^UNICODE}
+X<${^UNICODE}>
Reflects certain Unicode settings of Perl. See L<perlrun>
documentation for the C<-C> switch for more information about
This variable was added in Perl 5.8.2.
=item ${^UTF8CACHE}
+X<${^UTF8CACHE}>
This variable controls the state of the internal UTF-8 offset caching code.
1 for on (the default), 0 for off, -1 to debug the caching code by checking
This variable was added in Perl 5.8.9.
=item ${^UTF8LOCALE}
+X<${^UTF8LOCALE}>
This variable indicates whether a UTF-8 locale was detected by perl at
startup. This information is used by perl when it's in
Mnemonic: use ^V for Version Control.
=item ${^WIN32_SLOPPY_STAT}
-X<sitecustomize> X<sitecustomize.pl>
+X<${^WIN32_SLOPPY_STAT}> X<sitecustomize> X<sitecustomize.pl>
If this variable is set to a true value, then C<stat()> on Windows will
not try to open the file. This means that the link count cannot be
=item $PREMATCH
=item $`
-X<$`> X<$PREMATCH>
+X<$`> X<$PREMATCH> X<${^PREMATCH}>
The string preceding whatever was matched by the last successful
pattern match, not counting any matches hidden within a BLOCK or C<eval>
Mnemonic: C<`> often precedes a quoted string.
=item ${^PREMATCH}
-X<${^PREMATCH}>
+X<$`> X<${^PREMATCH}>
This is similar to C<$`> ($PREMATCH) except that it does not incur the
performance penalty associated with that variable, and is only guaranteed
=item $POSTMATCH
=item $'
-X<$'> X<$POSTMATCH>
+X<$'> X<$POSTMATCH> X<${^POSTMATCH}> X<@->
The string following whatever was matched by the last successful
pattern match (not counting any matches hidden within a BLOCK or C<eval()>
Mnemonic: C<'> often follows a quoted string.
=item ${^POSTMATCH}
-X<${^POSTMATCH}>
+X<${^POSTMATCH}> X<$'> X<$POSTMATCH>
This is similar to C<$'> (C<$POSTMATCH>) except that it does not incur the
performance penalty associated with that variable, and is only guaranteed
=item $LAST_SUBMATCH_RESULT
=item $^N
-X<$^N>
+X<$^N> X<$LAST_SUBMATCH_RESULT>
The text matched by the used group most-recently closed (i.e. the group
with the rightmost closing parenthesis) of the last successful search
=item %LAST_PAREN_MATCH
=item %+
-X<%+>
+X<%+> X<%LAST_PAREN_MATCH>
Similar to C<@+>, the C<%+> hash allows access to the named capture
buffers, should they exist, in the last successful match in the
This variable was added in Perl 5.6.
+=item %LAST_MATCH_START
+
=item %-
-X<%->
+X<%-> X<%LAST_MATCH_START>
Similar to C<%+>, this variable allows access to the named capture groups
in the last successful match in the currently active dynamic scope. To
to do a lot of inserting and don't want to keep modifying C<$_>. See
L<perlrun> for the B<-i> switch.
-=item Handle->output_field_separator EXPR
+=item Handle->output_field_separator( EXPR )
=item $OUTPUT_FIELD_SEPARATOR
Mnemonic: what is printed when there is a "," in your print statement.
-=item HANDLE->input_line_number(EXPR)
+=item HANDLE->input_line_number( EXPR )
=item $INPUT_LINE_NUMBER
Mnemonic: many programs use "." to mean the current line number.
-=item HANDLE->input_record_separator(EXPR)
+=item HANDLE->input_record_separator( EXPR )
=item $INPUT_RECORD_SEPARATOR
On VMS, record reads are done with the equivalent of C<sysread>,
so it's best not to mix record and non-record reads on the same
-file. (This is unlikely to be a problem, because any file you'd
+file. (This is unlikely to be a problem, because any file you'd
want to read in record mode is probably unusable in line mode.)
Non-VMS systems do normal I/O, so it's safe to mix record and
non-record reads of a file.
Mnemonic: / delimits line boundaries when quoting poetry.
-=item HANDLE->autoflush(EXPR)
-
-=item $OUTPUT_AUTOFLUSH
-
-=item Handle->output_record_separator EXPR
+=item Handle->output_record_separator( EXPR )
=item $OUTPUT_RECORD_SEPARATOR
Mnemonic: you set C<$\> instead of adding "\n" at the end of the print.
Also, it's just like C<$/>, but it's what you get "back" from Perl.
+=item HANDLE->autoflush( EXPR )
+
+=item $OUTPUT_AUTOFLUSH
+
=item $|
X<$|> X<autoflush> X<flush> X<$OUTPUT_AUTOFLUSH>
(regardless of whether the channel is really buffered by the system or
not; C<$|> tells you only whether you've asked Perl explicitly to
flush after each write). STDOUT will typically be line buffered if
-output is to the terminal and block buffered otherwise. Setting this
+output is to the terminal and block buffered otherwise. Setting this
variable is useful primarily when you are outputting to a pipe or
socket, such as when you are running a Perl program under B<rsh> and
-want to see the output as it's happening. This has no effect on input
-buffering. See L<perlfunc/getc> for that.
See L<perldoc/select> on
+want to see the output as it's happening. This has no effect on input
+buffering. See L<perlfunc/getc> for that. See L<perldoc/select> on
how to select the output channel. See also L<IO::Handle>.
Mnemonic: when you want your pipes to be piping hot.
=over 8
-=item HANDLE->format_formfeed(EXPR)
-
-=item $FORMAT_FORMFEED
-
=item $ACCUMULATOR
=item $^A
unless you call C<formline()> yourself and then look at it. See
L<perlform> and L<perlfunc/formline()>.
+=item HANDLE->format_formfeed(EXPR)
+
+=item $FORMAT_FORMFEED
+
=item $^L
X<$^L> X<$FORMAT_FORMFEED>
=over 8
-=item $EXTENDED_OS_ERROR
-
=item ${^CHILD_ERROR_NATIVE}
X<$^CHILD_ERROR_NATIVE>
This variable was added in Perl 5.8.9.
+=item $EXTENDED_OS_ERROR
+
=item $^E
X<$^E> X<$EXTENDED_OS_ERROR>
=item %ERRNO
=item %!
-X<%!>
+X<%!> X<%OS_ERROR> X<%ERRNO>
Each element of C<%!> has a true value only if C<$!> is set to that
value. For example, C<$!{ENOENT}> is true if and only if the current
=over 8
+=item $OFMT
+
=item $#
-X<$#>
+X<$#> X<$OFMT>
C<$#> was a variable that you could be use to format printed numbers.
After a deprecation cycle, its magic was removed in Perl 5.10 and
Removed in Perl 5.10.
+=item $ARRAY_BASE
+
=item $[
-X<$[>
+X<$[> X<$ARRAY_BASE>
This variable stores the index of the first element in an array, and
of the first character in a substring. You use to be able to assign to
Deprecated in Perl 5.12.
+=item $OLD_PERL_VERSION
+
=item $]
-X<$]>
+X<$]> X<$OLD_PERL_VERSION>
The version + patchlevel / 1000 of the Perl interpreter. This variable
can be used to determine whether the Perl interpreter executing a
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