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'jobs' is a shell built-in command, see Bash
bash> help jobs
jobs: jobs [-lnprs] [jobspec ...] or jobs -x command [args]
Lists the active jobs. The -l option lists process id's in addition to the normal information; the -p option lists process id's only. If -n is given, only processes that have changed status since the last notification are printed. JOBSPEC restricts output to that job. The -r and -s options restrict output to running and stopped jobs only, respectively. Without options, the status of all active jobs is printed. If -x is given, COMMAND is run after all job specifications that appear in ARGS have been replaced with the process ID of that job's process group leader.