topic Re: Cut command usage in in Operating System - Tru64 Unix

Cut command usage in

sammer — Mon, 13 Oct 2008 04:07:02 GMT

Hi,

$ ps -aef |grep mountd*
root 546 1 0.0 Oct 09 ?? 0:00.03 /usr/sbin/mountd -n -i -n
root 562 1 0.0 Oct 09 ?? 0:00.00 /usr/sbin/automount -m /net -hosts -nosuid
root 45657 13758 0.0 10:18:27 pts/0 0:00.01 grep mountd*

My main objective is to check for existing daemon (mountd) runs.If it runs i must kill particular pid's.

Say here i must do "kill -9 546" and kill -9 562". Please let me know how to use CUT or AWK command to kill above two pid's..

Thanks in Advance,
Shammer

Re: Cut command usage in

Dennis Handly — Mon, 13 Oct 2008 04:49:46 GMT

kill -9 $(ps -ef | grep -e "[m]ountd" -e "[a]utomount" | awk '{print $2}')

This works if you have a real shell, ksh. Add "echo" to the beginning to make sure it's correct.

Note: If you were on HP-UX you would never use grep but the -C option:
kill -9 $(UNIX95=ENHANCED_PS ps -opid= -C mountd,automount)

Re: Cut command usage in

Steven Schweda — Mon, 13 Oct 2008 04:59:00 GMT

First, what go you think that
grep mountd*
is doing? Hint:
mkdir new_dir
cd new_dir
and try your command again.

Second, you can eliminate your "grep" command
from the "ps" listing by using a popular
trick:

urtx# ps -aef | grep [m]ount
root 478 1 0.0 00:31:37 ?? 0:00.00 /usr/sbin/mountd -i
root 493 1 0.0 00:31:38 ?? 0:00.00 /usr/sbin/automount -m /net -hosts -nosuid

Third, I can remember how to use "sed", but
I'd need to read up on "awk" or "cut".

urtx# ps -aef | grep [m]ount | sed -e 's/ *[^ ]* *$[^ ]*$ .*/\1/'
478
493

If it's not obvious how to do the "kill"
commands from a list of pid's, then you might
try something like this:

urtx# ps -aef | grep [m]ount | sed -e 's/ *[^ ]* *$[^ ]*$ .*/\1/' | \
while read pid ; do echo kill ${pid} ; done
kill 478
kill 493

When you're happy, remove "echo".

Now that we've solved _that_ problem, what is
the _real_ problem which you are trying to
solve? And why would killing these processes
be the best way to solve it?

Re: Cut command usage in

Steven Schweda — Mon, 13 Oct 2008 05:05:27 GMT

And you had better hope that no one else runs
anything which your "grep" will falsely
interpret as one of the processes you're
trying to kill. Or else do a much more
precise search for the processes which you
_really_ wish to kill (user, parent pid, more
complete path, and so on), which would be
harder to do on one line.

> Note: If you were on HP-UX [...]

Yeah. I'd convert all _my_ software to get a
"ps" with that feature.

Re: Cut command usage in

sammer — Mon, 13 Oct 2008 09:24:48 GMT

Hi,

Thanks a lot for time on this..

Closing this thread..

Thanks,
Shammer