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Do you want to run a Linux or Unix/macOS program directly after some other process has ended? Use the pwait as follows:
```pwait pid && new_app1```
For example, for demo run sleep for 1200 and wait to end and then run the app2:

```sleep 1200 &
pwait pid_of_sleep_here && app2```

See the `pwait` man page for more info as syntax changes slightly between Linux and BSD version. This is very handy utility and not well known to many:
`man pwait`

a screenshot of the pwait manual page from Linux. The screenshot reads: NAME pwait — wait for processes to terminate SYNOPSIS pwait [-v] [-c] pid ... DESCRIPTION pwait waits until each of the given processes has terminated. The options are as follows: -v Print the exit status when each process terminates. -c Return 111 if any process exited non-successfully. EXIT STATUS The pwait utility exits 0 on success, and >0 if an error occurs. Invalid pids elicit a warning message but are otherwise ignored. ERRORS Check these prerequisites if you see this error: binding sk_nl error: Operation not permitted pwait requires special permissions to run, either root or the Linux CAP_NET_ADMIN capability. pwait only works on Linux kernels with the kernel options CONFIG_CONNECTOR=y CONFIG_PROC_EVENTS=y
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