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Jenkins Execute shell FAILURE

I was trying to run a jenkins Execute shell step with a grep to grep exceptions out of tomcat logs something like

echo "grepping logs for exceptions"
grep Exception purato.log*|grep -v WARN|grep -v DEBUG>error_summary.txt

problem was that if the log files had no exceptions then this step would fail and mark the job as failed. Now I wanted to mark the job as successful even though the grep didnt yeild any output. I tried various solutions from putting "exit 0" as last command but problem was jenkins would fail immediately first shell step it found failure.

Problem was jenkins starts shell with command

[workspace] $ /bin/sh -xe /tmp/hudson6722324600236337826.sh
 
from man pages 
"""
-e errexit  If not interactive, exit immediately if any untested command fails. 
            The exit status of a command is considered to be explicitly tested 
            if the command is used to control an if, elif, while, or until;
            or if the command is the left hand operand of an “&&” or “||” operator.
 
""" 

this -e means stop at first error.

adding "#!/bin/sh" at top of the shell solved the issue because now jenkins would respect this and wont start shell with -xe switch. Now it starts with

[workspace] $ /bin/sh /tmp/hudson342189479775158437.sh

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