The typical way to do this would be in the way
you run it from the command line, e.g.
./script.pl < infile > outfile
This would take STDIN from infile and put STDOUT
to outfile. The sh type shells and csh type
shells have different ways to do STDERROR. Under
bash, you'd do something like
./script.pl < infile > outfile 2> errfile
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