This script checks every 5 minutes if your working git repo has any changed content and if so, it'll "wall" a message to all connected Terminal shells.

dirty-git-check

#!/usr/bin/env bash

repodir="/opt/minecraft/mc-yeahwhat/plugins"
wallmsgprefix="[git] [plugin-configs]"
wallmsg="${wallmsgprefix} Caution: there are changes in \"${repodir}\" that are not tracked. Make sure to add and commit them!"
tempfile=$(mktemp /tmp/git-dirty_XXXXXXX)

####

echo ${wallmsg} > ${tempfile}

cd ${repodir}
if [[ `git status --porcelain` ]]; then
  wall -n ${tempfile}
fi

rm ${tempfile}

dirty-git-check_cron.d_file

#
# cronjobs file for dirty-git-check
#

*/5 * * * *        root       /usr/local/bin/dirty-git-check