shell execution produces "couldn't flush stdout" error

[Matthias]

Hello,

when using pipes in shell scripts I often get the error mentioned in the subject line.

To reproduce the issue add an "execute shell" build step to a new job and run the following:

echo replace e by a | sed 's_e_a_g' | echo done

This might not make much sense - but it generates the error "couldn't flush stdout" while this does not happen when executing the same in a terminal.


The jenkins console output produces:

[EnvInject] - Loading node environment variables.
Building on master in workspace /home/jenkins/build-server/jobs/test.sed/workspace
[workspace] $ /bin/sh -xe /tmp/hudson7236481234921041257.sh
+ echo replace e by a
+ echo done
done
+ sed s_e_a_g
sed: couldn't flush stdout: Broken pipe
Finished: SUCCESS

best regards,
Matthias

[John Russell]

I find I have much better luck in "Execute shell" build steps if I put

#!/bin/bash at the top.

It tends to make the behavior much more consistent. YMMV

[Matthias]

Hello,

thank you for the suggestion - but I already tried that but it didn't change the behaviour.

[John Russell]

Try adding a noop command after the pipeline. When I run that locally, done is printed long before it exits. Its possible sed is still running when jenkins tries to exit the script.

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[jjac...@zymergen.com]

I'm seeing something similar whenever I try to use pipes in a jenkins pipeline sh .  I've asked a similar question on SO http://stackoverflow.com/questions/42568201/jenkins-pipeline-sh-does-not-seem-to-respect-pipe-in-shell-command.  I can't seem to get piped shell commands to work, which seriously limits the power of what you can do.