#!/usr/bin/perl -l

$times = `(time ls) 2>&1 >/dev/null`;
print "/usr/bin/time:\n[$times]";

$times = `/bin/bash -c "(time ls) 2>&1 >/dev/null"`;
print "bash builtin:\n[$times]";

__END__
/usr/bin/time:
[0.00user 0.00system 0:00.00elapsed 114%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+396minor)pagefaults 0swaps
]
bash builtin:
[
real    0m0.008s
user    0m0.004s
sys     0m0.004s
]