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pkillhas no-loption, so you're just looking at the standard help message.--helpor its equivelant. Giving possible options for one specific argument in response to an unknown argument would be a very odd design decision in my opinion.pkill -l(at least on my Arch) does something completely different. You should always read the man page before trying random options.killcommand, so it does not even run the command/bin/killwhich the man page describes: it is instead described in the Bash Reference Manual, and judging by your output, you are running that. It also accepts signal names with or without theSIGprefix. Other shells may also have built-ins, or not (you don't tag which specific shell you are using).