Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//etc/cron.daily/passwd

 #!/bin/sh

cd /var/backups || exit 0

for FILE in passwd group shadow gshadow; do
        test -f /etc/$FILE              || continue
        cmp -s $FILE.bak /etc/$FILE     && continue
        cp -p /etc/$FILE $FILE.bak && chmod 600 $FILE.bak
done