没有X11的Linux实现远程键盘共享

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How to share keyboard/mouse in Linux without X11 environment

笔记本连个招呼都不打说死就死了，于是着手配置树莓派作为我的网络中心/手边唯一的linux终端。嵌入式就不要装X了。有X的话Synergy是跨平台共享鼠标键盘神器，显然没有图形服务器它根本不知道把输入往哪送。所以没有X的方案要解决两个问题：

We need to accomplish two things:
A. Login as root on startup automatically.
B. Send K/M actions

A

本来觉得很邪门了但是果然是有妥妥的办法的..

1)  添加行

NO_PASSWORD_CONSOLE tty1

到 /etc/login.defs

2) 在 /etc/inittab 找到

1:2345:respawn:/sbin/mingetty tty1

改成

1:2345:respawn:/sbin/mingetty –autologin root tty1

对我就直接登录了非常hěn呀的root

B

开始想写个脚本直接从SSH发送指令给tty1，琢磨了好久，发现一个叫console-tools的包里有指令writevt可以发送指令到/dev/tty1的input buffer里，但是不知道怎么按回车..
echo command > /dev/tty1 也是一样不知道怎么按回车.. 感觉好像不是这么用的。不过可以唤醒屏幕。
(后记: 确实不是这么用的 只是能发送显示字符串 另外发送 echo -ne “\033[9;0]” >/dev/tty1 就可以取消terminal的自动黑屏 参见 http://www.winds.org/pub/grdl/ANSI.txt , 为什么会有这种ANSI代码)
顷刻，突然想到直接在.bashrc里登录运行某个共享的screen就好了，~/.bashrc 写入
[bash]
if [ "$STY" = "" ]
#不想SSH也自动的话就
#if [ "$STY" = "" ] && [ `tty` = "/dev/pts/0" ]
then
if ! screen -list | grep -q "asdf"
then
screen -dmS asdf
fi
screen -x asdf
fi
[/bash]
-x是可以容许多用户登录同一个屏幕，所有内容完全同步。然后就行了，重启本尊，再分身SSH进去，本尊的屏幕很近的话就把分身SSH窗口拉到角落里看不见的地方，只要窗口激活输入就同步到本尊上，再设个快捷键，tsing.

A

1)  Add

NO_PASSWORD_CONSOLE tty1

To /etc/login.defs

2) In /etc/inittab Search for

1:2345:respawn:/sbin/mingetty tty1

Change to

1:2345:respawn:/sbin/mingetty –autologin root tty1

You can choose a different user of course. I use the raspberry Pi at home so, security is for pussies.

B

Simply tell bash to mount a Screen upon login. Append to ~/.bashrc
[bash]
if [ "$STY" = "" ]
#Or this if you don’t want to be mounted as SSH client
#if [ "$STY" = "" ] && [ `tty` = "/dev/pts/0" ]
then
if ! screen -list | grep -q "asdf"
then
screen -dmS asdf
fi
screen -x asdf
fi
[/bash]
-x tolerates multiple mounts on a single screen. Optionally add a shortcut to your SSH client. There you go, it’s working really well for me.

120 thoughts on “没有X11的Linux实现远程键盘共享”

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