The Korn shell provides a job control mechanism that is virtually identical to the C shell version of BSD Unix. Job control allows programs to be stopped and restarted, moved between the foreground and background, their processing status to be displayed, and more. To enable the job control feature, the monitor option must be enabled with the set command:
$ set —o monitor
$ set —m
This can be put into the .profile file so that job control is automatically enabled at login. On most systems that provide the job control mechanism, this option is automatically enabled for interactive shells.
It can be checked by executing the ...