Linux:How To Use Pkill/Kill Command To Kill Linux Processes
Normally If one process occupied too much cpu useage or memory usage, then you will consider that if that process should be killed. or For unknow process or virus process, we must kill those process. In this post , you’ll see how to use pkill command to kill linux processes or end user’s session. how to use kill command to kill linux processes.
Use kill To Kill Linux Processes
The first thing is you need to find the process name or process id that you want to kill. then you can use ps command piped through grep command to find the process you want to kill, issue the following command:
ps -ef | grep httpd
See Output:
[root@devops ~]# ps -ef | grep http root 7503 1 2 22:40 ? 00:00:00 /usr/sbin/httpd apache 7505 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7506 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7507 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7508 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7509 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7510 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7511 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7512 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd root 7514 7477 0 22:40 pts/0 00:00:00 grep http
Next, you can use kill command to kill the process, such as: kill 7505 process, type the following command:
kill -9 7505
Output:
[root@devops ~]# kill -9 7505 [root@devops ~]# ps -ef | grep http root 7503 1 2 22:40 ? 00:00:00 /usr/sbin/httpd apache 7506 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7507 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7508 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7509 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7510 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7511 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7512 7503 0 22:40 ? 00:00:00 /usr/sbin/httpd root 7514 7477 0 22:40 pts/0 00:00:00 grep http
Use Pkill To Kill Process
You have been seen the above output , there are lots of httpd process, Do we have way to kill all of httpd process or how to end all apache user session.
So the below example will show you on using pkill command to kill all process owned by Apache user. issue the following command:
pkill -9 -u apache
Output:
[root@devops ~]# ps -ef | grep http apache 7506 1 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7507 1 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7508 1 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7509 1 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7510 1 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7511 1 0 22:40 ? 00:00:00 /usr/sbin/httpd apache 7512 1 0 22:40 ? 00:00:00 /usr/sbin/httpd root 7525 7477 0 22:47 pts/0 00:00:00 grep http [root@devops ~]# pkill -9 -u apache [root@devops ~]# ps -ef | grep http root 7528 7477 0 22:55 pts/0 00:00:00 grep http [root@devops ~]#
pkill command also support regular expression, so you can give a pattern to match process name you want to kill. such as: pkill httpd. it will kill all process that match “httpd” pattern.
See Also:
