ChemBoy already noted that $0 contains the name of the script, not the name of the current file.

But he didn't point out that including "." includes the current working directory in @INC, which has no connection with the location of the file your code is in. Furthermore including "." explicitly is redundant - Perl includes "." in @INC already.

The information about variables is covered, of course, in perlvar. The __FILE__ literal in perldata. And the knowledge of what directory "." is is covered in any introduction to filesystems.

In reply to Re (tilly) 2: Breaking a script into smaller files by tilly
in thread Breaking a script into smaller files by John M. Dlugosz

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