$FORMAT_LINES_LEFT
${^RE_TRIE_MAXBUF} Controls how certain regex optimisations are applied and how much memory they utilize. This value by default is 65536 which
$` The string preceding whatever was matched by the last successful pattern match, not counting any matches hidden within a BLOCK or
$. Current line number for the last filehandle accessed. Each filehandle in Perl counts the number of lines
$NR
${^CHILD_ERROR_NATIVE} The native status returned by the last pipe close, backtick (`` )
$* $* was a variable that you could use to enable multiline matching. After a deprecation
$PERLDB
@F The array @F contains the fields of each line read in when autosplit mode is turned on
$~ The name of the current report format for the currently selected output channel. The default format name is the same as the filehandle name
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