Re^2: Error trapping while capturing stdout


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Re^2: Error trapping while capturing stdout

by ccarden (Monk)

on Sep 14, 2004 at 15:35 UTC ( [id://390876]=note: print w/replies, xml )

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in reply to Re: Error trapping while capturing stdout
in thread Error trapping while capturing stdout

Thanks for confirming my understanding of 2>&1|.

Now you got me thinking, with your second point. The called script does, indeed exit with a code. How would perl -w affect that? If perl gives warnings, it doesn't change the script's exit code. So I could still get an exit code of 0, but with warnings from the interpreter.

Another unwanted behavior that wasn't trapped was perl exiting with a "bad interpreter" message. I tracked it down to hidden carriage returns (thanks to vi's [dos] message), but the calling script should have caught that. I'll test your suggestion for trapping.

Thanks.

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Re^3: Error trapping while capturing stdout
by Random_Walk (Prior) on Sep 14, 2004 at 16:15 UTC

You would still get the warnings if you redeirected STDERR to STDOUT but if you trust the called script to exit non-zero when it fails then you no longer need to examine STDERR. You can throw it away with 2>&/dev/null and just test the exit value from the script.

Fixing the warnings may also help ;-)

The bad interpreter error would also return a non-zero value to the calling script and get caught in the $? test.

Cheers,
R.

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