${^CHILD_ERROR_NATIVE} The native status returned by the last pipe close, backtick (`` )

$< The real uid of this process. You can change both the real uid and the effective uid at the same time by using

$LAST_PAREN_MATCH

$<digits> ($1, $2, ...) Contains the subpattern from the corresponding set of capturing parentheses from the last successful pattern

@F The array @F contains the fields of each line read in when autosplit mode is turned on

$EFFECTIVE_GROUP_ID

$SUBSEP

$^R The result of evaluation of the last successful (?{ code }) regular expression assertion (see

%INC The hash %INC contains entries for each filename included via the

$# $# was a variable that could be used to format printed numbers. After a deprecation cycle