$^ The name of the current top-of-page format for the currently selected output channel. The default is the name of the filehandle with

$[ 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

$b Special package variables when using sort()

$] The revision, version, and subversion of the Perl interpreter, represented as a decimal of the form 5.XXXYYY, where XXX is the version /

%^H The %^H hash provides the same scoping semantic as

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

%ERRNO

INIT These compile phase keywords are documented in

CHECK These compile phase keywords are documented in

${^TAINT} Reflects if taint mode is on or off. 1 for on (the program was run with -T), 0 for off, -1 when only taint warnings are enabled