笔记本切换内部或者外部显示器脚本

#!/bin/bash

function usage() {
    pro=$(basename $0)
    echo "Welcome to $pro, version 0.1"
    echo "code by slucx([e-mail])"
    echo "$pro [inside/outside/all/toggle/help]"
    echo "arguments:"
    echo -e "\t inside - use inside monitor"
    echo -e "\t outside - use outside monitor"
    echo -e "\t all - use both inside and outside monitors"
    echo -e "\t toggle - toggle the monitor"
    echo -e "\t help - print this document"
}

# set backgroud
eval $(cat ~/.fehbg)

# vars
inside=0
outside=1
all=2
mm="/tmp/monitor.chg"

# devices
dev_inside="LVDS1"
if [[ $(xrandr | grep "HDMI1 connected") ]]; then
    dev_outside="HDMI1"
elif [[ $(xrandr | grep "VGA1 connected") ]]; then
    dev_outside="VGA1"
else
    dev_outside=$dev_inside
fi

# if not exist, create it
[[ -f $mm ]] || echo $inside > $mm

# set value
v=$(cat $mm)
if [ $# == 1 ]; then
    case $1 in
    "inside")
     [ $v == $inside ] && exit
        v=$inside
        echo $inside > $mm
     ;;
    "outside")
     [ $v == $outside ] && exit
        v=$outside
        echo $outside > $mm
     ;;
    "all")
     [ $v == $all ] && exit
        v=$all
        echo $all > $mm
     ;;
    "toggle")
        v=$(($v + 1))
     [[ $v -le $outside ]] || v=$inside
        echo $v > $mm
     ;;
    "help")
        usage
        exit
     ;;
    *)
        echo "Unknown command '$1'..."
        usage
        exit
     ;;
    esac
elif [ $# == 0 ]; then        # use outside monitor first
    v=$outside
    echo $outside > $mm
fi

# change monitor
case $v in
    $all)
    if [ "$dev_outside"x != "$dev_inside"x ]; then
        echo "using all"
        xrandr --output $dev_outside --left-of $dev_inside --auto --output $dev_inside --auto
    fi
    ;;
    $outside)
    if [ "$dev_outside"x != "$dev_inside"x ]; then
        echo "using outside monitor"
        xrandr --output $dev_outside --auto --output $dev_inside --off
    fi
    ;;
    $inside)
    echo "using inside monitor"
    xrandr --output $dev_inside --auto
    if [ "$dev_outside"x != "$dev_inside"x ]; then
        xrandr --output $dev_outside --off
    fi
    ;;
    *)
    ;;
esac

用法： 假设脚本名称为monitor.sh
monitor.sh inside 使用内部显示器
monitor.sh outside 使用外部显示器
monitor.sh all 同时使用，外部显示器在左
monitor.sh 尝试优先使用外部显示器
monitor.sh toggle 切换内部和外部显示器

注：显示器设备名称可能不一致，具体的可以通过xrandr查询