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?

>>1
$ killall -q '>>1'
killall: unknown signal q; valid signals:
HUP INT QUIT ILL TRAP ABRT EMT FPE KILL BUS SEGV SYS PIPE ALRM TERM URG STOP
TSTP CONT CHLD TTIN TTOU IO XCPU XFSZ VTALRM PROF WINCH INFO USR1 USR2
$ killall '>>1'
No matching processes belonging to you were found
$ echo $?
1
$ killall '>>1' >/dev/null >&/dev/null | true
$ echo $?
0