Lists information about each given process (job) or all active processes if the job argument is omitted. The -l flag lists process ID numbers in addition to the normal information. The -n flag only displays jobs that have stopped or exited since last notified. The -p flag causes only the process group to be listed. See the ksh(1) reference page for a description of the format of the job argument.
The bg command puts each specified process into the background. The current process is put in the background if job is not specified.
The fg command brings each process specified to the foreground. Otherwise, the current process is brought into the foreground.