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

$0 Contains the name of the program being executed. On some (but not all) operating systems assigning to

$[ 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

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

seekdir DIRHANDLE,POS Sets the current position for the

$^H WARNING: This variable is strictly for internal use only. Its availability, behavior, and contents are subject to change without notice

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