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if [[ ${#@} == 1 ]]; then red=$1 green=$1 blue=$1 brightness=1 else red=$1 green=$2 blue=$3 brightness=${4:-1} fi declare -a outputs=( $(xrandr --query --current | perl -nle 'm{^(\S+) connected} and print $1' ) ) for o in "${outputs[@]}"; do xrandr --output "$o" --gamma "${red}:${green}:${blue}" --brightness "$brightness" done
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