Z:gnu-bash--10ba95-Wait for process completion an/en

Wait for process completion and return exit status. Waits for each process specified by a PID and reports its termination status. If PID is not given, waits for all currently active child processes, and the return status is zero. PID must be a process ID. Exit Status: Returns the status of the last PID; fails if PID is invalid or an invalid option is given.