With perl5.8 and above, you can easily capture what the
subroutine prints like:
# create a variable to store the output in
my $output = "";
# open a "file" that will store output in the variable
# (requires 5.8; before that use CPAN module IO::Scalar)
open my $fh, ">", \$output or die "Unexpected open to scalar failure:
+$!";
# save the default output file handle
my $select_save = select($fh);
# call your function
call_function();
# clean up
select($select_save);
close $fh;
# use output
print "Got output: $output\n";
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