Notify and lock screen on Ubuntu Linux

5min_gnome.sh

#!/bin/sh
eval "export $(egrep -z DBUS_SESSION_BUS_ADDRESS /proc/$(pgrep -u $LOGNAME gnome-session)/environ)"
/usr/bin/notify-send -i face-wink "Пятиминутка" "Сделай паузу!"
/bin/sleep 2
loginctl lock-session 3

5min_unity.sh

#!/bin/sh

# get_display [USER] -- Returns $DISPLAY of USER.
# If first param is omitted, then $LOGNAME will be used.
get_display () {
    who \
        | grep ${1:-$LOGNAME} \
        | perl -ne 'if ( m!\(\:(\d+)\)$! ) {print ":$1.0\n"; $ok = 1; last} END {exit !$ok}'
}

DISPLAY=$(get_display) || exit
export DISPLAY
/usr/bin/notify-send -i face-wink "Пятиминутка" "Сделай паузу!"
/bin/sleep 2
loginctl lock-session 3