jobs — Lists the active jobs
jobs is bash build-in command, which is used to list the actives jobs in the current shell.
$ sleep 60 & — Just run this command 5 times. Create dummy active jobs for testing.
$ jobs — List all active jobs.
$ jobs -l — List all active jobs with pid.
$ jobs -p — List only the pid of all active jobs.
$ jobs -n — List only jobs that have changed status since the last notification are printed.
$ jobs -r — Show only running jobs.
$ jobs -s — Show only stopped jobs.
Read : man jobs / help jobs (in Bash Shell)