killall(1)

I think this command needs to support a -Q switch that does the following:

- Outputs nothing if no processes were killed (like -q)
- Returns exit code 0 if no processes were killed (unlike -q)

Good with you all?

Only thing is, shell scripts consider return code 0 successful and anything nonzero as a failure.

That if you use "boolean chains", which is purely sintactic sugar. Do you think that breaking portability and patching/recompiling one of the coreutils is better than adding two lines to your script?