note pobocks <p>__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.</p> <p>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__.</p> <p>Example code:</p> <p><b>File 1 - firstfile</b></p> <code> #!/usr/bin/perl -w use strict; print $0 . "\n"; print __FILE__ . "\n"; do 'filetwo'; </code> <p><b>File 2 - filetwo</b></p> <code> #!/usr/bin/perl -w use strict; print $0 . "\n"; print __FILE__ . "\n"; </code> <p>It's simplistic, but should show the basic concept.</p> <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-572803"> <code>for(split(" ","tsuJ rehtonA lreP rekcaH")){print reverse . " "}print "\b.\n";</code> </div></div> 995692 995692