Pedantic nonsense. Most of the time when you're using kill you're going be using the bash shell built-in, where it is syntactically correct. kill [-s sigspec |

Pedantic nonsense. Most of the time when you're using kill you're going be using the bash shell built-in, where it is syntactically correct. kill [-s sigspec | -n signum | -sigspec] [pid | jobspec] ... Even so, with /bin/kill -sigspec is still valid and common usage, even if it is not documented in the manpage.