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

ARGVOUT The special filehandle that points to the currently open output file when doing edit-in-place processing with -i. Useful when

$$ The process number of the Perl running this script. Though you can set this variable, doing so is generally discouraged, although

$^C The current value of the flag associated with the -c switch. Mainly of use with -MO=... to allow code to alter its behavior

@- $-[0] is the offset of the start of the last successful match

$INPUT_LINE_NUMBER

$FORMAT_TOP_NAME

$OLD_PERL_VERSION

$^O The name of the operating system under which this copy of Perl was built, as determined during the configuration process. For examples

@ARG