wait(2) - perldoc - phpman

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⚡ TLDR: wait (tldr-pages)

Wait for a process to complete before proceeding.

Wait for a process to finish given its process ID (PID) and return its exit status
wait {{pid}}
Wait for all processes known to the invoking shell to finish
wait
Wait for a job to finish (run `jobs` to find the job number)
wait %{{job_number}}
Display help
wait --help

    wait    Behaves like wait(2) on your system: it waits for a child
            process to terminate and returns the pid of the deceased
            process, or -1 if there are no child processes. The status is
            returned in $? and "${^CHILD_ERROR_NATIVE}". Note that a return
            value of -1 could mean that child processes are being
            automatically reaped, as described in perlipc.

            If you use "wait" in your handler for $SIG{CHLD}, it may
            accidentally wait for the child created by "qx" or "system". See
            perlipc for details.

            Portability issues: "wait" in perlport.