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widget1 --flag < input_file | widget2 | widget3 > output_file

#!/usr/bin/perl
open $in_fh,  "<$in" or die $!;
open $out_fh, ">$out" or die $!;
XS_widget( $in_fh, $out_fh );   # reads stuff from $in_fh and writes s
+tuff to $out_fh