To display the state of any background jobs that you are currently running use the job command. For example:
jobs [1] + Running xterm -g 90x55 [2] - Running xterm -g 90x55
This displays the job number, its state and the command associated with this job.
To display the process number use the -l option. For example:
jobs -l [1] + 3584 Running xterm -g 90x55 [2] - 3587 Running xterm -g 90x55