Example script.

backup-etc.sh (text/plain), 471 bytes, created by Jérôme Poulin on 2006-02-07 22:32:28 UTC

#!/bin/bash -x

cd /root/etc-bak
CURDATE=$(date +%Y-%m-%d@%H:%M:%S)
find /etc -printf "%T@ %p %s %u:%g %m\n" > ${CURDATE}.new
if [ -e lastdate.diff ]; then
  diff -q $(cat lastdate.diff) ${CURDATE}.new > /dev/null
  UPSQFS=$?
  rm -f *.diff
fi

mv ${CURDATE}.new ${CURDATE}.diff
echo ${CURDATE}.diff > lastdate.diff
rm -f *.new

if [ $UPSQFS -ne 0 ]; then
  mksquashfs /etc etc-$(date +%Y-%m-%d).sqfs -keep-as-directory -append-suffix "_$(date +%H:%M:%S)" > /dev/null
fi