You can always use open2 if you want a bidirectional pipe. This program pipes the command to tr(1) to get back a modified command:
use IPC::Open2;
open2 ( REA, WRI, 'tr a-z A-Z' ) or die $!;
for (<DATA>){
print {\*WRI} [(my $cmd, my @rest) = split]->[0];
}
close WRI;
print <REA>;
__END__
an apple a day
boat for bloat
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