while true; do
    xsetroot -name  "$( date +"%F %R" )"
    sleep 1m
done &

csum=""
new_csum=$(sha1sum $(which dwm))
while true; do
    if [ "$csum" != "$new_csum" ]; then
        csum=$new_csum
        dwm 2> ~/.dwm.log
    else
        exit 0
    fi
    new_csum=$(sha1sum $(which dwm))
    sleep 0.5
done