ARGV The special filehandle that iterates over command-line filenames in @ARGV . Usually

${^POSTMATCH} This is similar to $' ($POSTMATCH

$SUBSEP

$` The string preceding whatever was matched by the last successful pattern match, not counting any matches hidden within a BLOCK or

$- The number of lines left on the page of the currently selected output channel. Mnemonic: lines_on_page -

$~ The name of the current report format for the currently selected output channel. The default format name is the same as the filehandle name

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

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

$EFFECTIVE_GROUP_ID

$* $* was a variable that you could use to enable multiline matching. After a deprecation