monitor_off

#!/bin/bash

##############################################################
# Copyright (C) 2009 Vinicius (Arch Linux Forums)            #
# https://bbs.archlinux.org/viewtopic.php?pid=506374#p506374 #
# Copyright (C) 2018 BrainwreckedTech                        #
# Fixed greps, added verbiage, added test capability         #
##############################################################
# Check if X is running or not, turn off monitor,            #
# wait for a key press and turn it on again.                 #
##############################################################

grep_result_file=$PWD'/x_running'

# Check if X is running.
ps -e | grep -e "\bX\b" > $grep_result_file
ps -e | grep -e "\bXorg\b" >> $grep_result_file
ps -e | grep -e "\bXserver\b" >> $grep_result_file

## If you want to check result file, uncomment following lines.
#echo "===== $grep_result_file - begin ====="
#cat $grep_result_file
#echo "===== $grep_result_file -  end  ====="

if [ ! -s $grep_result_file ] || [[ $(tty) =~ tty ]] || [[ $(tty) =~ vc ]]; then
    echo 'Detected X not runnig or you are at console...'
    if [ $UID -ne 0 ]; then
        echo 'You need super user privileges to run this script at console.'
        echo 'Rerun as super user or start X and run from a terminal.'
        exit 0
    fi
    if [ "${1}" == "test" ]; then
      echo "Will use vbetool to turn monitor(s) on and off"
    else
      turn_off='vbetool dpms off'
      turn_on='vbetool dpms on'
    fi
else
    echo 'Detected X running.'
    echo 'Monitor(s) will turn on with the next keyboard or mouse event.'
    if [ "${1}" == "test" ]; then
      echo "Will use xset to turn monitor(s) on and off"
    else
      turn_off='xset dpms force off'
  fi
fi

if [ "${1}" != "test" ]; then
  echo 'Turning off monitor...'
  $turn_off

  if [ -n "${turn_on}" ]; then
    echo 'Waiting for a key press...'
    read -n1 -s

    echo 'Turning on monitor...'
    $turn_on
  fi
fi

rm $grep_result_file

echo 'Finished: monitor_off'