beanstalkd(1) on Linux
The text 9a3b2134b849, as Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
A simple, fast work queue.
Flags it lists
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-F -
-b -
-d -
-f -
-h -
-l -
-p -
-s -
-u -
-z