Shell script to use in a Jenkins job for displaying whether a given Jenkins slave node is up or down. Use this as an "execute shell" build step. NB: Must be run on a machine that has bash (i.e. not Windows)

nodestatus.sh

NODE_NAME="name-of-node"
ENDPOINT="http://JENKINSURL_GOES_HERE/computer/api/xml?xpath=computerSet/computer\[displayName='$NODE_NAME'\]/offline/text()"
ENDPOINT_RESULT=$(curl $ENDPOINT 2> /dev/null)

if [ $ENDPOINT_RESULT = "false" ] ; then
  exit 0
fi
exit 1