jobs [ -dlprs ] [ job ... ]
jobs -Z string
       Lists information about each given job, or all jobs if job is
       omitted.  The -l flag lists process IDs, and the -p flag lists
       process groups.  If the -r flag is specified only running jobs
       will be listed and if the -s flag is given only stopped jobs are
       shown.  If the -d flag is given, the directory from which the job
       was started (which may not be the current directory of the job)
       will also be shown.

       The -Z option replaces the shell's argument and environment space
       with the given string, truncated if necessary to fit.  This will
       normally be visible in ps (ps(1)) listings.  This feature is
       typically used by daemons, to indicate their state.

       Full job control is only available in the top-level interactive
       shell, not in commands run in the left hand side of pipelines or
       within the (...) construct.  However, a snapshot of the job state
       at that point is taken, so it is still possible to use the jobs
       builtin, or any parameter providing job information.  This gives
       information about the state of jobs at the point the subshell was
       created.  If background processes are created within the subshell,
       then instead information about those processes is provided.

       For example,

              sleep 10 &    # Job in background
              (             # Shell forks
              jobs          # Shows information about "sleep 10 &"
              sleep 5 &     # Process in background (no job control)
              jobs          # Shows information about "sleep 5 &"
              )
