wait(1)
NAME
wait − await completion of process
SYNTAX
wait
DESCRIPTION
The wait command waits until all background processes have completed and then reports on abnormal terminations.
Because the wait(2) system call must be executed in the parent process, the Shell itself executes wait, without creating a new process.
RESTRICTIONS
Not all the processes of a 3- or more-stage pipeline are children of the Shell, and thus can’t be waited for.