Within a module (say a.pm) used from a program (say b.pl), __FILE__ will be a.pm but $0 will be b.pl.
The test you posted checks whether the file that contains it is being run as a 'main' program, or is being used or required, or done or eval'd.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP Neil Armstrong
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