Linux Gnome caffeinate shell script - Keep system awake / prevent sleep, like caffeinate on macOS

caffeinate

#!/usr/bin/bash

# caffeinate: Keep system awake / prevent sleep, like caffeinate on macOS.
# for Gnome desktop
# USAGE:
#   Place this script somewhere in $PATH and set executable.
#   Run `caffeinate` from terminal.
#   Hit Ctrl-C to stop.
#   To timeout, run `timeout SECONDS caffeinate`, where SECONDS is # of seconds.

START=`date +%s`
POWER_SCHEMA=org.gnome.settings-daemon.plugins.power

SLEEP_AC_KEY=sleep-inactive-ac-type
SLEEP_BATTERY_KEY=sleep-inactive-battery-type

SAVED_AC=$(gsettings get $POWER_SCHEMA $SLEEP_AC_KEY 2>/dev/null)
SAVED_BATTERY=$(gsettings get $POWER_SCHEMA $SLEEP_BATTERY_KEY 2>/dev/null)

gsettings set $POWER_SCHEMA $SLEEP_AC_KEY 'nothing' 2>/dev/null
gsettings set $POWER_SCHEMA $SLEEP_BATTERY_KEY 'nothing' 2>/dev/null

trap revert EXIT
revert() {
    gsettings set $POWER_SCHEMA $SLEEP_AC_KEY $SAVED_AC 2>/dev/null
    gsettings set $POWER_SCHEMA $SLEEP_BATTERY_KEY $SAVED_BATTERY 2>/dev/null
    END=`date +%s`
    RUNTIME=$((END-START))
    echo ""
    echo "Caffeinated for $RUNTIME seconds"
    exit
}

read -r -d '' _ </dev/tty