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Top Forums Shell Programming and Scripting How to get exit code in a pipe-lined command? Post 302157010 by pankai on Wednesday 9th of January 2008 07:11:43 PM
Old 01-09-2008
How to get exit code in a pipe-lined command?

I have a question about how to get the exit code of the first command when it appears in a pipe-lined command.
For example, I have the following script:

grep abc dddd | tee -a log
if [[ $? -ne 0 ]]
then
echo "ERROR!"
fi

In the above script, [[ $? -ne 0 ]] is supposed to test the exit code of "grep abc dddd". But since it is in a pipe line, the $? actually stores the exit code of "tee -a log". So, [[ $? -ne 0 ]] is always false.

How to address this problem?

Thanks.
 

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tee(1)							      General Commands Manual							    tee(1)

NAME
tee - pipe fitting to copy standard output to file SYNOPSIS
[file]... DESCRIPTION
The command transcribes the standard input to the standard output and makes copies in the files. Options This option ignores interrupts. This option appends the output to the files rather than overwriting the files. EXTERNAL INFLUENCES
Environment Variables determines the language in which messages are displayed. If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari- able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multibyte character code sets are supported. RETURN VALUE
The command returns zero upon successful completion, or nonzero if the command fails. EXAMPLES
Write a list of users to the screen and also append the list to the file STANDARDS CONFORMANCE
tee(1)
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