Currently, I use a line like this in my sh script file:
kill $(ps aux | grep -F 'myServer' | grep -v -F 'grep' | awk '{ print $2 }')
But I wonder how to call it only if process (myServer here) is running?
9 Answers
I usually just use pgrep and pkill
if pgrep myServer; then pkill myServer; fi
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10Why not
pkill myServerorkillall -q myServer? There's no downside to attempting to kill inexistent processes. Oct 3, 2014 at 15:57 -
16It will not exit 0 if there is no process to kill, so it could break scripts. Oct 6, 2014 at 15:00
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12
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True, but you won't have the flexibility to add a else to inform you the process was already dead. Oct 6, 2014 at 16:57
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You could kill processes by name using pkill or killall, check their man pages.
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yes, unlike
kill, this kills only if process is running. For examplepkill -u myuser -f myprocess\.[0-9]+– Chase T.Jun 26, 2017 at 18:50
A bit of a different approach would be something like this:
killall PROCESS || echo "Process was not running."
This will avoid the 1 Error-Code returned from the killall command, if the process did not exist. The echo part will only come into action, if killall returns 1, while itself will return 0 (success).
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8
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3Warning,
killall -qisn't supported on all unix flavors, macOS Catalina still doesn't have it.– tresfOct 4, 2019 at 14:36 -
1
Check if the process exist with pidof. If it does, kill it:
(! pidof process_name) || sudo kill -9 $(pidof process_name)
Exit code is always 0 after executing the above command.
Use pkill with option -f
pkill -f myServer
Option -f is the pattern that is normally matched against the process name.
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You can also put
-2before-fto shut the process down more gracefully (same as pressing Ctrl + C).– jobukkitNov 6, 2023 at 17:52
Small Script I have created with R&D. I hope you will like it
#!/bin/bash
echo "Enter the process name:"
read $proc_name
if pgrep $proc_name; then
echo "$proc_name running "
pkill $proc_name
echo "$proc_name got killed"
else
echo "$proc_name is not running/stopped "
fi
save it with some name like script.sh
then
chmod +x script.sh
./script.sh
Then give your process name.
Note: I have tried many times with this and its fine.
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May I know whats wrong with this script and -ve vote needs an explanation please.– Raja GOct 5, 2014 at 5:33
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pkill -9 -f jboss || true
or
pkill -9 -f tomcat || true
try using:
sudo kill `pidof process_name`
where process_name is the name of the process you want to kill. What's great about this is that pidof will list the pid's of all processes matching the given name. Since kill accepts multiple pid's, it will kill of all of them in a single whim.
Let me know if this helps.
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What if list is empty? (my main point was not to call kill at all if possible) Jan 31, 2012 at 12:44
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1If the list is empty, kill will return an error code 1 and not kill anything. It would be the equivalent as trying to call kill with no arguments. You could add an if statement that first checks if pidof returns an empty list. If it does not return an empty list, call
kill `pidof process_name. If it does return an empty list, skip the kill call.– amandionJan 31, 2012 at 12:59
I would use:
ps x --no-header -o pid,cmd | awk '!/awk/&&/myServer/{print $1}' | xargs -r kill
The xargs -r tells to run kill only if there is input. The ps --no-header -eo pid,cmd gets the output into a better format for parsing.
killonly when the process is running, because there is a race condition between the test and the invocation ofkill(it's possible the process stopped for another reason in that short time). You should usepkillorkillallwhich do exactly the same as what you try to do, but with less to type (and probably some other advantages too).pgrep