Z:gnu-bash--d816b9-Wait for job completion and re/en

Wait for job completion and return exit status. Waits for each process identified by an ID, which may be a process ID or a   job specification, and reports its termination status. If ID is not given, waits for all currently active child processes, and the return status is zero. If ID is a a job specification, waits for all processes in that job's pipeline. If the -n option is supplied, waits for the next job to terminate and returns its exit status. Exit Status: Returns the status of the last ID; fails if ID is invalid or an invalid option is given.