Dashboard Linux monitor control for Ubuntu/Raspian

sleepscreen.sh

#!/usr/bin/env bash

set -euo pipefail
IFS=$'\n\t'

readonly VBETOOL=/usr/sbin/vbetool

turn_off_screen() {
    if [[ -x "$VBETOOL" ]]; then
        "$VBETOOL" dpms off
    else
        xset -display :0 dpms force off
    fi
}

turn_on_screen() {
    if [[ -x "$VBETOOL" ]]; then
        "$VBETOOL" dpms on
    else
        xset -display :0 dpms force on
    fi
}

main() {
    if [[ -x "$VBETOOL" && "$UID" != 0 ]]; then
        echo "This script must be run as root when using vbetool"
        exit 1
    fi

    local WAKE_START_HOUR=8
    local WAKE_END_HOUR=18
    local SATURDAY=6

    local CURRENT_HOUR=$(date +"%k")
    local DAY_OF_WEEK=$(date +"%u")

    if [[ "$CURRENT_HOUR" -ge "$WAKE_START_HOUR" && "$CURRENT_HOUR" -lt "$WAKE_END_HOUR" && "$DAY_OF_WEEK" -lt "$SATURDAY" ]]; then
        turn_on_screen
    else
        turn_off_screen
    fi
}

main