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open MORE,"|more" or die "wtf hax:$!";
open HELP,"help|" or die"more hax:$!";
print MORE <HELP>;

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use IPC::Open2;
open HELP,"help|" or die"more hax:$!";
...
print MORE_WRITE <HELP>;
close MORE_WRITE; #send eof so the program will give us stdout
print <MORE_READ>;