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i3 brightness script

mkdir scripts
touch scripts/bright

nano/leafpad/gedit  bright
#!/usr/bin/env bash
set -e
if [ "$#" -eq 0 ]; then
cat <<-eof p="">Usage: $0 [command]
Increase or decrease screen brightness at hardware level by steps of 10% of
max, as determined by the values under /sys/class/backlight/**. Limit values
to the range of 0 to max_brightness.

up | Increase brightness by 10%
down | Decrease brightness by 10%
current | Report current brightness

This script needs root access - sudo is an option, but you may also consider
allowing your user to run the script without a password prompt e.g.:
exit 1
# Gather information
device_dir=$(ls "${backlight_dir}" | head -n 1)
if [ -z "$device_dir" ]; then
echo 'No backlight hardware is listed in /sys/class/backlight! Quitting.'
exit 1
curr_brightness=$(cat "${brightness_file}")
max_brightness=$(cat "${device_dir}/max_brightness")

if [ "$1" == 'current' ]; then
echo $( echo "(${curr_brightness} / ${max_brightness}) * 100" | bc -l) \
| cut -d'.' -f 1

# Calculate
step=$(( $max_brightness / 10 ))
if [ $direction == 'up' ]; then
new_brightness=$(( $curr_brightness + $step ))
elif [ $direction == 'down' ]; then
new_brightness=$(( $curr_brightness - $step ))
echo 'Argument $1 must be either "up" or "down". Quitting.'
exit 1
# Limit range
if [ "$new_brightness" -gt "$max_brightness" ]; then
if [ "$new_brightness" -lt 0 ]; then

# "Do it" - the emperor
echo $new_brightness > "${brightness_file}"

#for no password prompt
sudo visudo
Cmnd_Alias BRIGHT_CMDS=~/scripts/bright up, ~/scripts/bright down
user_name ALL=(root) NOPASSWD: BRIGHT_CMDS
on .config/i3/config
# Brightness controls
bindsym XF86MonBrightnessUp exec sudo ~/scripts/bright up; exec notify-send -t 1 "Brightness: $(~/scripts/bright current)%"
bindsym XF86MonBrightnessDown exec sudo ~/scripts/bright down; exec notify-send -t 1 "Brightness: $(~/scripts/bright current)%"
for notification in i3 install dunst and autostart it using exec_always dunst

changer owner of bright script to root to prevent misuse
cd scripts
sudo chown root bright
credits/source :


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