Bash-连接USB设备时如何运行代码 [英] Bash - How to run code whenever USB device is connected

问题描述

我正在编写一个bash脚本，以自动检测USB键盘何时插入笔记本电脑(运行Ubuntu 14)，因此可以自动更改键盘布局.

I am writing a bash script to automatically detect when my USB keyboard is plugged into my laptop (running Ubuntu 14), so I can change the keyboard layout automatically.

到目前为止，这是我的代码(我是从Stack Overflow的另一篇文章中获得的，所以我不确定100％如何工作)

Here is my code so far (I got it from another post on Stack Overflow so I'm not 100% sure how it works)

#!/bin/bash
setxkbmap es
for dev in /sys/bus/usb/devices/ *-*:*
do
    if [ -f $dev/bInterfaceClass ]
    then
        if [[ "$(cat $dev/bInterfaceClass)" == "03" && "$(cat $dev/bInterfaceProtocol)" == "01" ]]
        then
            setxkbmap gb
        fi
    fi
done

到目前为止，我已经可以在启动时运行它了……但是我希望它每次连接或断开USB设备时都可以运行.

I have got this to run on startup so far... But I'd like it to run every time a USB device is connected or disconnected.

重要的是，我都必须在一个Bash脚本中运行它们，而不是在... udev/...或任何文件中以.rules文件的形式运行.但是，只有一个Python脚本也可以.

It is important that I have it all run in one Bash script and not as a .rules file in ...udev/... or anything. However, a single Python script will do just as well.

推荐答案

感谢 ralf htp 提出以下解决方案.它具有以下改进:

Thanks to ralf htp I was able to come up with the following solution. It has the following improvements:

• 它不依赖于特定的键盘，它将以相同的方式对待所有USB键盘.
• 如果用户手动切换到其他键盘布局(既不是默认键盘布局也不是USB键盘布局)，它将不会自动将其切换回默认键盘布局或USB布局.

请随时通过 GitHub Gist

#!/bin/bash
kbd1=es #default keyboard layout
kbd2=gb #USB keyboard layout

flag=0
while true
do
    layout="$(setxkbmap -query | grep -a layout | cut -c13-14)"
    if [[ $layout == $kbd1 ]] || [[ $layout == $kbd2 ]]
    then
        for dev in /sys/bus/usb/devices*-*
        do
            if [ -f $dev/bInterfaceClass ]
            then
                if [[ "$(cat $dev/bInterfaceClass)" == "03" && "$(cat 
$dev/bInterfaceProtocol)" == "01" ]]
                then
                    if [[ "$flag" == "0" ]]
                    then
                            setxkbmap $kbd2
                    fi
                    flag=1
                    break
                fi 
                if [[ "$flag" == "1" ]]
                then
                    setxkbmap $kbd1
                fi
                flag=0
            fi
        done
    fi
    sleep 5s
done

这篇关于Bash-连接USB设备时如何运行代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！