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$PROGRAM_NAME
$0

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$PROGRAM_NAME

Contains the name of the file containing the Perl script being executed. On some operating systems assigning to ``$0'' modifies the argument area that the ps(1) program sees. This is more useful as a way of indicating the current program state than it is for hiding the program you're running. (Mnemonic: same as sh and ksh.)

Source: Perl predefined variables
Copyright: Larry Wall, et al.

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$PROGRAM_NAME $0

$PROGRAM_NAME
$0