Message reminder

vi /path/to/message.sh

#!/bin/bash
PID=$(pgrep gnome-session)
dbus=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$PID/environ|cut -d= -f2-)
export DBUS_SESSION_BUS_ADDRESS=$dbus
notify-send -u critical "$1"

crontab:

0 * * * * /path/to/message.sh "my message"

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