What is the meaning of additional arguments beyond the filename as the 3rd?

Nothing with Perl 5.6 (I recall it gives some strange errors about undefined values), but with 5.8, you can specify a list of command line arguments to avoid using the shell as you can with system. 

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In reply to Re: more than 3 arguments to open? by Juerd
in thread more than 3 arguments to open? by John M. Dlugosz

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