wait(1)
NAME
wait − await completion of process
SYNTAX
wait
DESCRIPTION
The wait command waits until all processes started with & have completed, and report 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.