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__FILE__ is the file name that the __FILE__ token is in, and $0 is a variable containing the name of the program, as given to the shell.

They can most certainly be different - one case that comes to mind is a __FILE__ token in a library called by your program, but there are many others, particularly since you can assign to $0 (with varying effects on different OS), but you can't meaningfully assign to __FILE__.

Example code:

File 1 - firstfile

#!/usr/bin/perl -w use strict; print $0 . "\n"; print __FILE__ . "\n"; do 'filetwo';

File 2 - filetwo

#!/usr/bin/perl -w use strict; print $0 . "\n"; print __FILE__ . "\n";

It's simplistic, but should show the basic concept.

for(split(" ","tsuJ rehtonA lreP rekcaH")){print reverse . " "}print "\b.\n";

In reply to Re: Difference between $0 and __FILE__ by pobocks
in thread Difference between $0 and __FILE__ by solegaonkar

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