C:\temp>runn.pl -q Unknown option: q Usage: C:\temp\runn.pl [-n N] [-r] [-v] command arg1 arg2... Run command arg1, command arg2, etc., concurrently. Run no more than N processes simultaneously (default 1) -r: run commands in random order instead of specified order (unimpl.) -v: verbose mode C:\temp>runn.pl -n 2 dir *.txt *.pl -q exec: No such file or directory at C:\temp\runn.pl line 27. exec: No such file or directory at C:\temp\runn.pl line 27. exec: No such file or directory at C:\temp\runn.pl line 27.