(noobie) piping

[baudolino]

Want to know how to pipe the two commands below. The first one writes the pid of the process mpg123, the second one kills it.

 

$ps -C mpg123 -o pid=

2206

$kill -9 2206

 

Tried

$ps -C mpg123 -o pid= |kill -9

without success.

Thanks.

 

baudolino

[fuzzylizard]

try this

 

$ pd=`ps -C mpg123 -o pid=` | kill -9 $pd

 

and see if that works.

[baudolino]

:-(

it doesn't

[Steve Scrimpshire]

Why not just

 

killall -e mpg123

?

[aru]

why piping here? just use the output of your first command as a parameter for the second one:

 

~$ kill -9 $(ps -C mpg123 -o pid=)

 

or

 

~$ kill -9 $(/sbin/pidof mpg123)

 

 

but Steve Scrimpshire is right, the more stright forward way will be using /usr/bin/killall:

~$ killall -e -s SIGKILL mpg123

 

 

btw, usually SIGKILL (same as kill -9) is not a good idea since the process killed that way probably won't be able to close itself the right way. Is better to try to kill it with a signal 15 (SIGTERM), and if that doesn't work, then kill it with signal 9.

[theYinYeti]

Yes, killall is easier, and try without -9 first.

Also the $(ps ...) idea is good.

 

Anyway if you still want to do this with a pipe, this should work:

ps -C progname -o pid | xargs kill

or

ps -C progname -o pid | xargs kill -9

 

Yves.