This script will turn on / off the screen of the Mac or run the screen saver and return screen status

screen.sh

#!/bin/sh

# @(#) This script will turn on / off the screen of the Mac or run the screen saver.
# @(#) Argument:on, off, saver and display_status. Support macOS Mojave version.20181016

if [ -z "$1" ]; then
  echo "Argument is missing!"
  exit 1
elif [ "$1" == "on" ]; then
  caffeinate -u -t 1
elif [ "$1" == "off" ]; then
  pmset displaysleepnow
elif [ "$1" == "saver" ]; then
  open /System/Library/CoreServices/ScreenSaverEngine.app
elif [ "$1" == "saver_status" ]; then
  ps ax|grep [S]creenSaverEngine > /dev/null
    if [ "$?" != "0" ] ; then
    #echo "Screensaver is disabled."
    echo "0"
  else
    #echo "Screensaver is enabled."
    echo "1"
  fi
elif [ "$1" == "display_status" ]; then
  # 最後のuserの操作からの秒数を返す
  IDLETIME=$((`ioreg -c IOHIDSystem | sed -e '/HIDIdleTime/ !{ d' -e 't' -e '}' -e 's/.* = //g' -e 'q'` / 1000000000))
  #echo Idle Time is $IDLETIME
  if [ "$IDLETIME" -gt "299" ]; then
    #echo "User is away."
    echo "0"
  else 
    #echo "User is working."
    echo "1"
  fi
else
  echo "Invalid argument!"
  exit 1
fi