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Full Discussion: How to get exit code in a pipe-lined command?
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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LEARN ABOUT X11R4

tee

TEE(1)								   User Commands							    TEE(1)

NAME

       tee - read from standard input and write to standard output and files

SYNOPSIS

       tee [OPTION]... [FILE]...

DESCRIPTION

       Copy standard input to each FILE, and also to standard output.

       -a, --append
	      append to the given FILEs, do not overwrite

       -i, --ignore-interrupts
	      ignore interrupt signals

       -p     diagnose errors writing to non pipes

       --output-error[=MODE]
	      set behavior on write error.  See MODE below

       --help display this help and exit

       --version
	      output version information and exit

   MODE determines behavior with write errors on the outputs:
       'warn' diagnose errors writing to any output

       'warn-nopipe'
	      diagnose errors writing to any output not a pipe

       'exit' exit on error writing to any output

       'exit-nopipe'
	      exit on error writing to any output not a pipe

       The default MODE for the -p option is 'warn-nopipe'.  The default operation when --output-error is not specified, is to exit immediately on
       error writing to a pipe, and diagnose errors writing to non pipe outputs.

AUTHOR

       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report tee translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/tee>
       or available locally via: info '(coreutils) tee invocation'

GNU coreutils 8.28						   January 2018 							    TEE(1)
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