Job Control Options
- if you've got a simple command suspened, say 'mutt', and you forgot that you have already got a mutt running and try to start another mutt, the old running mutt is resumed, rather than starting a new process
- run background jobs at lower priority
- send SIGHUP to background processes on exit.
- report status of background jobs immediately
- if set, stopped jobs are disowned and restarted immediately
- report status of bg-jobs if exiting a shell with job control enabled