wait(1)
Name
wait − wait for process completion
Syntax
wait [pid]
Description
The wait command waits until all processes started with an ampersand (&) have completed and reports on abnormal terminations.
If a numeric pid is given and is the process ID of a background process, then wait waits until that process is completed. If pid is not a background process, wait waits until all background processes have completed.
Because the wait() system call must be executed in the parent process, the Shell itself executes wait without creating a new process.
Restrictions
Because not all the processes of a 3- or more-stage pipeline are children of the Shell, the wait command does not work on them.
The [pid] is available only with sh5.