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Replacement for system('foo <bar >bar') without using a shell.
Would solve quoting problems once and for all.
includes a test routine with a few tests, lacking tests for stderr redirection
right now
needs to be tested on windows too!
Ideas for running tests (Unix):
# echo abc > Cin; echo 123 >> Cin
perl redir.pl # interactive, just keep typing 'y' <ENTER>
yes | perl redir.pl
yes | perl redir.pl >Pout 2>Perr
yes | perl redir.pl >Pcomb 2>&1
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