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Author SHA1 Message Date
Jilles Tjoelker
3dec7d0c15 sh: Check whether dup2 was successful for >&FD and <&FD. 
A failure (usually caused by FD not being open) is a redirection error.

Exp-run done by:	pav (with some other sh(1) changes)
 2010-10-24 20:09:49 +00:00