bash does have built-in "kill", compare "kill -l" and "/bin/kill -l" and run "type kill" which says "kill is a shell builtin". The "which" command is not builtin so can't tell.

And NetBSD's sh and OpenBSD's /bin/sh (which is ksh) also have built-in kill.

DragonFly and FreeBSD do not.

--reed

Changed to reflect this, KevinDKinsey

also "type" is for bourne shells, but not in csh. "which" is builtin for "csh" that works for that --reed

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May be useful or interesting to mention that "kill -STOP" is same as suspend and "kill -CONT" will restart suspended process. --reed