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- wait pid
- Waits for the process identified by process id pid to
- terminate, either due to an untrapped signal or call to
- exit system call. Wait returns a list containing three
- elements: The first element is the process id of the
- process that terminated. If the process exited
- normally, the second element is `EXIT', and the third
- contains the numeric exit code. If the process
- terminated due to a signal, the second element is
- `SIG', and the third contains the signal name. If the
- process is currently stopped (on systems that support
- SIGSTP), the second element is `STOP', followed by the
- signal name.
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