Managed concurrency in the bash shell

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Concurrency is all the rage these days. I started to wonder about using it in my command shell (which is regrettably still bash) because so much of the infrastructure for job control is already in place. I’ve been using xargs -P for a while, but I wondered about doing it all in the shell. 
 “conc” 
 I came up with a super-simple function to do some experiments: 
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Read on /posts/2013-05-23-managed-concurrency-in-the-bash-shell/ ↗