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POSIX standard
Posted by Benoit Papillault on Feb 2, 2011 in Linux
The POSIX-2004 standard is available online at : http://pubs.opengroup.org/onlinepubs/009695399/
In particular, the part regarding shell is here : http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html