List all running or stopped jobs, or list those specified by jobIDs. For example, you can check whether a long compilation or text format is still running. Also useful before logging out. See the earlier section "Job Control."
List job IDs and process group IDs.
List only jobs whose status changed since last notification. Korn shell only.
List process group IDs only.
Replace each job ID found in cmd with the associated process ID and then execute cmd. Not valid for Korn shell.