NAME
wait - await completion of process

SYNOPSIS
wait

DESCRIPTION
Wait 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.

SEE ALSO
sh(1)

BUGS
Not all the processes of a 3- or more-stage pipeline are children
of the Shell, and thus can’t be waited for. (This bug does not
apply to csh(1).)