brightness-inc

#!/bin/bash

# Discover monitor name with: xrandr | grep " connected"
# and set MONITOR

MONITOR=""
STEP="0.05"
MIN="0.1"

CurrBrightLine=$( xrandr --verbose --current | grep ^"$MONITOR" -A5 | tail -n1 )
CurrBright="${CurrBrightLine##* }"

if [[ "$1" == "-" ]] ; then
    Sign=-
elif [[ "$1" == "+" ]] ; then
    Sign=
else
    echo "invalid argument $1, must be + or -" >&2
fi

NewBright=$(python -c "print(round(max($MIN, $CurrBright + $Sign$STEP), 3))")

xrandr --output "$MONITOR" --brightness "$NewBright"   # Set new brightness

echo "$CurrBright  -->  $NewBright"

# printf "Monitor $MONITOR "
# echo $( xrandr --verbose --current | grep ^"$MONITOR" -A5 | tail -n1 )