Steps to Kill a Running Process in Ubuntu Linux

In order to kill a running process on Ubuntu Linux, you can make use of the kill or command.

Step 1: Identify the PID (Process ID) for the running process to be killed.

% ps -ef

UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 09:04 pts/0    00:00:00 /bin/bash
root       244     1  0 09:06 pts/0    00:00:00 sh
root       250   244  0 09:07 pts/0    00:00:00 bash
root       440   250  0 10:14 pts/0    00:00:00 sh
root       449   440  0 11:35 pts/0    00:00:00 ps -ef

Step 2: Execute the kill command

% kill -9 440

killed!

Step 3: Verify that the running process is killed!

# ps -ef

UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 09:04 pts/0    00:00:00 /bin/bash
root       244     1  0 09:06 pts/0    00:00:00 sh
root       250   244  0 09:07 pts/0    00:00:00 bash
root       450   250  0 11:38 pts/0    00:00:00 ps -ef

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Man Page: https://manpages.ubuntu.com/manpages/trusty/en/man1/kill.1posix.html