$cmd = [qw(dir /b /s /a-d | p4 -x - add)];
run3($cmd, \$stdin, \$stdout, \$stderr); 
print "$stderr\n";

OUTPUT:-
dir: /b: No such file or directory
dir: /s: No such file or directory
dir: /a-d: No such file or directory
dir: |: No such file or directory
dir: p4: No such file or directory
dir: -: No such file or directory
dir: add: No such file or directory