$INPUT_LINE_NUMBER

$FORMAT_FORMFEED

${^PREMATCH} This is similar to $` ($PREMATCH) except that it does not incur the performance

$[ This variable stores the index of the first element in an array, and of the first character in a substring. The default is 0, but you could

$^N The text matched by the used group most-recently closed (i.e. the group with the rightmost closing parenthesis) of the last successful

$^H WARNING: This variable is strictly for internal use only. Its availability, behavior, and contents are subject to change without notice

$> The effective uid of this process. For example: $<

$MATCH

${^MATCH} This is similar to $& ($MATCH

IO::Handle->output_record_separator( EXPR )