nvidia brightness control

nvbright.sh

#!/bin/bash
# nvidia brightness control

nvrc=~/.nvidia-settings-rc

# increments
brightness=.075
contrast=.05
gamma=.04

###
b=$(sed -n 's/.*RedBrightness=\(.*\)/\1/p' ${nvrc})
c=$(sed -n 's/.*RedContrast=\(.*\)/\1/p' ${nvrc})
g=$(sed -n 's/.*RedGamma=\(.*\)/\1/p' ${nvrc})

up() {
  b1=$(bc <<< "${b}+${brightness}")
  c1=$(bc <<< "${c}+${contrast}")
  g1=$(bc <<< "${g}+${gamma}")
}

down() {
  b1=$(bc <<< "${b}-${brightness}")
  c1=$(bc <<< "${c}-${contrast}")
  g1=$(bc <<< "${g}-${gamma}")
}

restore() {
  b1=0.000000
  c1=0.000000
  g1=1.00000
}

die() {
  [[ $* ]] && echo "$*"
  exit 1
}

if [ -z "$1" ]; then
  cat << eof
usage: ${0##*/} [OPTION] 
  -u      adjust up
  -d      adjust down
  -r      reset
eof
  exit 1
fi

case $1 in
  -u)
  up
  shift;;
  -d)
  down
  shift;;
  -r)
  restore
  shift;;
  *)
  die "Unknown option '$1'";;
esac


sed -i 's/Brightness.*/Brightness='${b1}'/;s/Contrast.*/Contrast='${c1}'/;s/Gamma.*/Gamma='${g1}'/' ${nvrc}
nvidia-settings --load-config-only