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04-22-2007
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Checking return value of commands in pipe
Hi,
I am wondering how I can check the return value of all commands in a pipe such as gzip -dc file.gz | sort -u > output.txt If I run this sequence in bash and check $?, I get the return status from sort. But I want to know if the initial gzip failed. Similarly for longer pipe chains, I want to know if any of the components returned an error status. I don't mind if you give a solution for another shell such as tcsh. Any solution is great! Thanks! 
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04-22-2007
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See if PIPESTATUS helps. From man sh
Code:
PIPESTATUS
An array variable (see Arrays below) containing a list of exit
status values from the processes in the most-recently-executed
foreground pipeline (which may contain only a single command).
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