illumos gate

If you specify an option to pkill/pgrep that requires an argument without said argument, you get a somewhat confusing "illegal option" error instead of a more helpful "missing argument" error.

$ pkill c
pkill: illegal option - c
Usage: pkill [-signal] [-fnovx] [-P ppidlist] [-g pgrplist] [-s sidlist]
[-u euidlist] [-U uidlist] [-G gidlist] [-J projidlist]
[-T taskidlist] [-t termlist] [-z zonelist] [-c ctidlist] [pattern]

This should print 'missing argument' instead of 'illegal option'.