I'm using two slaves, Windows and Linux. In the first case I have cywing so 
I execute commands in both slaves through sh:

...
node(label) {
sh '''#!/bin/bash -xei
   whoami
   echo $?
   case $- in
       *i*) echo This shell is interactive ;;
       *)   echo This shell is not interactive ;;
   esac
   echo d = $?'''
}
...


I put the $? in order to understand why, sometimes, after executing the 
build Jenkins returns an error (script returned exit code -1) even if all 
the exit values are 0s. It seems to be a random error. Most of the time the 
build is correct, but in some cases it returns this annoyng -1 exit value 
without a reason.

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