$INPUT_LINE_NUMBER
ARGVOUT The special filehandle that points to the currently open output file when doing edit-in-place processing with -i. Useful when
$OUTPUT_FIELD_SEPARATOR
%^H The %^H hash provides the same scoping semantic as
%ERRNO
$^C The current value of the flag associated with the -c switch. Mainly of use with -MO=... to allow code to alter its behavior
$^O The name of the operating system under which this copy of Perl was built, as determined during the configuration process. For examples
$^V The revision, version, and subversion of the Perl interpreter, represented as a version object. This variable
$$ The process number of the Perl running this script. Though you can set this variable, doing so is generally discouraged, although
$" When an array or an array slice is interpolated into a double-quoted string or a similar context such as /
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