Roger Hardiman wrote:
> Build calls Stage1. Stage1 will return with an error code in some cases
> and we want to trap this and halt the Build script.
>
> ./stage1 2>&1 | tee stage1.out
> if [ "X$?" != "X0" ] ; then
>
> Normally, $? will return the Exit Status of the last executed program.
> However, due to the pipe through Tee, the Exit Status I get is the
> exit status of Tee and not the exit status of the Stage1 script.
>
> I still want to output the stage1 script to screen and a log file.
> How can I do this and preserve the exit status for the Build script.
There's a bit about this in the "Csh Programming Considered Harmful"
document, showing how "easy" it is in the Bourne shel:
Consider the pipeline:
A | B | C
You want to know the status of C, well, that's easy: it's in $?, or
$status in csh. But if you want it from A, you're out of luck -- if
you're in the csh, that is. In the Bourne shell, you can get it,
although doing so is a bit tricky. Here's something I had to do where
I ran dd's stderr into a grep -v pipe to get rid of the records in/out
noise, but had to return the dd's exit status, not the grep's:
device=/dev/rmt8
dd_noise='^[0-9]+\+[0-9]+ records (in|out)$'
exec 3>&1
status=`((dd if=$device ibs=64k 2>&1 1>&3 3>&- 4>&-; echo $? >&4) |
egrep -v "$dd_noise" 1>&2 3>&- 4>&-) 4>&1`
exit $status;
See http://www-uxsup.csx.cam.ac.uk/csh.html for the rest.
so
exec 3>&1
exit_code=`((./stage1 2>&1 1>&3 3>&- 4>&-; echo $? >&4) |
tee stage1.out 1>&2 3>&- 4>&-) 4>&1`
exec 3>&-
or something, should get it for you. I used `exit_code' rather than
`status' because `$status' is read-only in zsh, but that shouldn't be a
problem for plain old sh. You'd better add some comments explaining just
what it does :-)
--
Ben Smithurst | PGP: 0x99392F7D
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