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Programming Perl

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7.2.13 English - Use English or awk Names for Punctuation Variables

use English;
...
if ($ERRNO =~ /denied/) { ... }

This module provides aliases for the built-in "punctuation" variables. Variables with side effects that get triggered merely by accessing them (like $0) will still have the same effects under the aliases.

For those variables that have an awk(1) version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either as $RS or as $INPUT_RECORD_SEPARATOR if you are using the English module.

Here is the list of variables along with their English alternatives:

PerlEnglishPerlEnglish
@_@ARG$?$CHILD_ERROR
$_$ARG$!$OS_ERROR
$&$MATCH$!$ERRNO
$`$PREMATCH$@$EVAL_ERROR
$'$POSTMATCH$$$PROCESS_ID
$+$LAST_PAREN_MATCH$$$PID
$.$INPUT_LINE_NUMBER$<$REAL_USER_ID
$.$NR$<$UID
$/$INPUT_RECORD_SEPARATOR$>$EFFECTIVE_USER_ID
$/$RS$>$EUID
$|$OUTPUT_AUTOFLUSH$($REAL_GROUP_ID
$,$OUTPUT_FIELD_SEPARATOR$($GID
$,$OFS$)$EFFECTIVE_GROUP_ID
$\$OUTPUT_RECORD_SEPARATOR$)$EGID
$\$ORS$0$PROGRAM_NAME
$"$LIST_SEPARATOR$]$PERL_VERSION
$;$SUBSCRIPT_SEPARATOR$^A$ACCUMULATOR
$;$SUBSEP$^D$DEBUGGING
$%$FORMAT_PAGE_NUMBER$^F$SYSTEM_FD_MAX
$=$FORMAT_LINES_PER_PAGE$^I$INPLACE_EDIT
$-$FORMAT_LINES_LEFT$^P$PERLDB
$~$FORMAT_NAME$^T$BASETIME
$^$FORMAT_TOP_NAME$^W$WARNING
$:$FORMAT_LINE_BREAK_CHARACTERS$^X$EXECUTABLE_NAME
$^L$FORMAT_LINEFEED$^O$OSNAME


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