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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