1.Become a superuser or root user to terminate the process of the another user.
2.Obtain the PID of the process to be terminated.

Syntax:
$ps –fu

Example:
$ps –fu abc
abc 325 322 3 jan 12 ? 11:04 /usr/openwin/bin/sun

The process ID is displayed in the first column of the output.

Terminate the process using kill command.
$ kill pid
Default signal number is -15 {SIGKILL}
-9 {SIGTERM}

Verifying if the process is terminated or not.
$pgrep   _{Your Comment}