$^ The name of the current top-of-page format for the currently selected output channel. The default is the name of the filehandle with
$FORMAT_FORMFEED
IO::Handle->output_record_separator( EXPR )
$= The current page length (printable lines) of the currently selected output channel. The default is 60. Mnemonic:
%+ Similar to @+ , the %+ hash allows
$WARNING
$[ 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
@- $-[0] is the offset of the start of the last successful match
$EFFECTIVE_USER_ID
$INPUT_LINE_NUMBER
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