To kill a single process:
ps PID TT STAT TIME COMMAND 9408 p9 S 0:00 ue temp2.xdh 9450 pa S 0:01 -Tcsh (Tcsh) 9501 pa T 0:00 less csh.1 9503 pa R 0:00 ps kill 9501
This kills process number 9501. Notice that the ps command which is entered to check on the process ID's has the latest process number.
To kill a process that refuses to die:
kill -9 9352
This makes a certain kill of process number 9352.
To kill a background job:
jobs  + Running xterm -g 70x55 kill %1  Done xterm -g 70x55
This kills job number 1 (one); the only job that is currently running. The Bourne shell does not support this feature.
To kill more than one process:
kill 8939 9543
This kills processes 8939 and 9543.