[JIRA] (JENKINS-9852) expr evaluating to zero stops shell script

[b.w.doughe...@gmail.com (JIRA)]

Brendan Dougherty commented on JENKINS-9852 expr evaluating to zero stops shell script This is actually the correct behavior. By default, Jenkins invokes /bin/sh with the -e (errexit) flag, and expr has an exit status of 1 when the _expression_ evaluates to zero. Some potential ways to deal with this: Use the shell's arithmetic evaluation: foo=$((foo-1)) Use bc: foo=`echo "$foo-1" | bc` Change the shell invocation as described by the help button for the Execute Shell build step

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