That seems like a perl limitation, not a unix one, since there are plenty of ways to do this in perl and without.
For whatever reason, you have to use fork or modules (like IPC::Open3 or whatever) in unix. Actually, why does system(1,$cmd) work at all? I don't see that documented. It's possible I'm blind. I'm cutting down on coffee.
UPDATE: I still don't see how that's a unix problem, rather than a perl one; but I guess I understand your animosity/reciprocity.
UPDATE2 (nov 1st): Your example (in a sibling post) also seems intentionally complex...
use strict;
use warnings;
use IPC::Open3;
use Data::Dumper;
my ($w,$r,$e, @pids);
push @pids, open3($w,$r,$e, qw(ls -al));
push @pids, open3($w,$r,$e, qw(ls -al));
push @pids, open3($w,$r,$e, qw(borked mang));
# tye commented privately that I seem to misunderstand open3, so I jus
+t thought
# I'd mention that I'm perfectly aware I'm screwing up the file handle
+s both by
# reusing them and failing to close them. This is just an example...
+ Perhaps it's
# because the ls doesn't print to stdout? I suppose that isn't the sa
+me as system().
# *shrug*
my @ret = map {[waitpid($_,0) => $?]} @pids;
print "", Dumper(\@ret), "\n";
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