uid=
Process.uid= anInteger -> aNumeric
Sets the (integer) user id for this process. Not available on all platforms.

wait
Process.wait -> aFixnum

Waits for any child process to exit and returns the process id of that child. Raises a SystemError if there are no child processes. Not available on all platforms.

Process.fork { exit 1; } » 1500
Process.wait » 1500

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