bash SSH登录后如何清除终端？
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How to clear terminal after SSH login?
提问by prankousky
I am trying to connect to a server via ssh. Once connected, terminal should be cleared.
我正在尝试通过 ssh 连接到服务器。连接后，应清除端子。
Due to generated keys, I can connect to the server via ssh usr@svrwithout being prompted a password. This works.
由于生成了密钥，我可以通过连接到服务器ssh usr@svr而不会提示输入密码。这有效。
In order to get rid off
为了摆脱
The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law.
Debian GNU/Linux 系统中包含的程序是免费软件；每个程序的确切分发条款在 /usr/share/doc/*/copyright 中的各个文件中进行了描述。
在适用法律允许的范围内，Debian GNU/Linux 不附带任何保证。
I would usually just type clear. However, I would prefer not to type this every time but automate the procedure instead.
我通常只会输入clear. 但是，我不希望每次都键入此内容，而是自动执行该过程。
ssh usr@svr "clear"--> "TERM environment variable not set.". I googled several solutions about unset environment variables, but without success.
ssh usr@svr "clear"--> “未设置 TERM 环境变量。”。我用谷歌搜索了几个关于未设置环境变量的解决方案，但没有成功。
So instead, I tried ssh -t usr@vr "clear"; this successfully clears the terminal, but also closes the connection right away ("Connection to IP closed."). Computer connects to server, clears the screen, closes the connection.
所以相反，我尝试了ssh -t usr@vr "clear"; 这成功地清除了终端，但也立即关闭了连接（“IP 连接关闭。”）。计算机连接到服务器，清除屏幕，关闭连接。
Next attempt was to create a bash script on the server to be run after connecting to it.
下一次尝试是在服务器上创建一个 bash 脚本，以便在连接到它后运行。
#/bin/bash
clear
## cl.sh, chmod +x
ssh usr@svr ./cl.sh--> "TERM environment variable not set.".
ssh usr@svr ./cl.sh--> “未设置 TERM 环境变量。”。
Another attempt was to create a bash script connecting to the server and clearing the terminal via ENDSSH.
另一种尝试是创建一个连接到服务器的 bash 脚本并通过ENDSSH.
#/bin/bash
ssh usr@svr <<'ENDSSH'
clear
ENDSSH
## sc.sh, chmod +x
Running this results in:
运行这个结果：
> ./sc.sh
Pseudo-terminal will not be allocated because stdin is not a terminal.
Linux raspberrypi 3.18.7-v7+ #755 SMP PREEMPT Thu Feb 12 17:20:48 GMT 2015 armv7l
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
TERM environment variable not set.
I am a beginner at this, so please be patient if I have made a very obvious mistake. I tried to be as detailed as possible and researched this before posting, but could not find an answer to my question. For example, commands other than "clear" work (ssh usr@svr ls), but that does not help me.
我是这方面的初学者，所以如果我犯了一个非常明显的错误，请耐心等待。我试图尽可能详细，并在发布之前对此进行了研究，但找不到我的问题的答案。例如，“清除”以外的命令有效 ( ssh usr@svr ls)，但这对我没有帮助。
采纳答案by prankousky
I have found another easy solution
我找到了另一个简单的解决方案
ssh -t usr@svr 'clear;bash'
回答by Michael Jaros
The text your question refers to is part of the message-of-the-day (MOTD).
您的问题所指的文本是每日消息 (MOTD) 的一部分。
If you can become root on the server, you can just modify that message in /etc/motd. Note that depending on the server's distribution, this file will usually be generated somehow (overwriting any changes), e.g. on Debian it is generated from /etc/motd.tailat boot, so you might have to change that file instead.
如果您可以成为服务器上的 root，您只需在/etc/motd. 请注意，根据服务器的分布，该文件通常会以某种方式生成（覆盖任何更改），例如在 Debian 上，它是/etc/motd.tail在启动时生成的，因此您可能必须更改该文件。
See manpage motd(5).
请参阅联机帮助页motd(5)。
回答by ccarton
To prevent that message from being printed you can create a file named .hushloginin your home directory (on the server). SSH to the server and run the command touch ~/.hushlogin. If that file exists then the login shell will no longer print the motd (message of the day) which is what you are seeing.
为了防止打印该消息，您可以.hushlogin在您的主目录（在服务器上）中创建一个文件。SSH 到服务器并运行命令touch ~/.hushlogin。如果该文件存在，则登录 shell 将不再打印您所看到的 motd（当天消息）。
回答by kenorb
All startup messages are defined in motdfile (/etc/motd).
所有启动消息都在motd文件 ( /etc/motd)中定义。
However if you'd like to having your console cleared to increase privacy, add the following code:
但是，如果您希望清除控制台以增加隐私，请添加以下代码：
[ -x /usr/bin/clear_console ] && /usr/bin/clear_console -q
Either to your .bash_profileor .bash_logout(on logout). Or by using clearcommand.
要么到您的.bash_profile要么.bash_logout（在注销时）。或者通过使用clear命令。
Clearing screen on logout is the default behaviour on Debian Linux distribution.
注销时清除屏幕是 Debian Linux 发行版的默认行为。
