Simplest monitoring script

diffdog

#!/bin/sh

umask 027

BASEDIR=/opt/diffdog
WORKERS_DIR=$BASEDIR/workers
RESULTS_BASEDIR=$BASEDIR/results
RECIPIENT="superuser@command.center"

find $WORKERS_DIR -maxdepth 1 -type f -perm -u+rx | while read SCRIPT ; do
    SCRIPT_NAME=$(basename $SCRIPT)
    RESULTS_DIR="$RESULTS_BASEDIR/$SCRIPT_NAME"
    RESULT_FILE=$(date -u +%Y%m%d-%H%M%S)
    DIFF_FILE=${RESULT_FILE}.diff
    mkdir -p $RESULTS_DIR
    echo " * Running "$(basename $SCRIPT)
    $SCRIPT > "$RESULTS_DIR/$RESULT_FILE"
    PREVIOUS_FILE=$(ls -rt $RESULTS_DIR | grep -v '\.diff' | tail -2 | head -1)
    if [ "$RESULT_FILE" = "$PREVIOUS_FILE" ] ; then
        echo " ! No previous file. First run?"
        continue
    fi
    (
        cd $RESULTS_DIR
        diff -U3 $PREVIOUS_FILE $RESULT_FILE > $DIFF_FILE
        if [ ! -s $DIFF_FILE ] ; then
            rm -f $DIFF_FILE
            rm -f $RESULT_FILE
            echo " . No changes. Great."
            continue
        else
            source-highlight -i $DIFF_FILE -o STDOUT | \
                mail -a 'Content-type: text/html; charset="us-ascii"' $RECIPIENT -s "[DIFFDOG] $SCRIPT_NAME"
        fi
    )
done