blocks|key|2793680|text|正如在"gitolite:+PTY+allocation+request+failed+on+channel+0“中所解释的，使用-T进行ssh测试连接非常重要，因为如果请求，某些服务器可能会完全中止事务。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2793681|-T避免请求所述终端，因为GitHub无意为您提供交互式安全外壳，您可以在其中键入命令。|2793682|GitHub只想回复您的ssh请求，以确定ssh命令确实有效(您拥有正确的公钥/私钥，并且公钥已经注册到your+GitHub+account)|2793683|PuTTy将是terminal+emulator、serial+console和网络文件传输应用程序的一个例子。它支持多种网络协议，包括SCP、SSH、Telnet和rlogin。|2793684|"PuTTY“的名字有no+definitive+meaning，尽管"tty”是Unix传统中的终端名称，通常被认为是+的缩写。|BOLD|2793685|2793686|-T的其他用例(测试之外)|2793687|2793688|Transferring+binary+files|unordered-list-item|2793689|Execute+commands+on+a+remote+server|2793690|SSH隧道：ssh+-fnT+-L+port:server:port+user@server+(后台的-f:你不想执行命令，不需要TTY，只想建立隧道)|2793691|2793692|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/10346575/6309|1|https://github.com/settings/ssh|2|http://en.wikipedia.org/wiki/PuTTY|3|http://en.wikipedia.org/wiki/Terminal_emulator|4|http://en.wikipedia.org/wiki/Serial_console|5|http://www.chiark.greenend.org.uk/~sgtatham/putty/faq.html#faq-meaning|6|https://serverfault.com/a/746638/783|7|http://unix.stackexchange.com/a/88616/7490^0|1T|2|4|1G|0|0|0|2|0|1G|J|1|0|0|5|2|7|H|3|P|E|4|0|1|5|Z|P|B|L|5|0|0|0|2|0|0|0|P|6|0|0|Z|7|0|6|14|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@$9|1P|A|1Q|1|1R]]|E|$]]|$1|F|3|G|5|6|7|1S|8|@$9|1T|A|1U|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1V|8|@]|D|@$9|1W|A|1X|1|1Y]]|E|$]]|$1|J|3|K|5|6|7|1Z|8|@]|D|@$9|20|A|21|1|22]|$9|23|A|24|1|25]|$9|26|A|27|1|28]]|E|$]]|$1|L|3|M|5|6|7|29|8|@$9|2A|A|2B|B|C]|$9|2C|A|2D|B|N]]|D|@$9|2E|A|2F|1|2G]]|E|$]]|$1|O|3|-4|5|6|7|2H|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|2I|8|@$9|2J|A|2K|B|C]]|D|@]|E|$]]|$1|R|3|-4|5|6|7|2L|8|@]|D|@]|E|$]]|$1|S|3|T|5|U|7|2M|8|@]|D|@$9|2N|A|2O|1|2P]]|E|$]]|$1|V|3|W|5|U|7|2Q|8|@]|D|@$9|2R|A|2S|1|2T]]|E|$]]|$1|X|3|Y|5|U|7|2U|8|@$9|2V|A|2W|B|C]]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|2X|8|@]|D|@]|E|$]]|$1|10|3|-4|5|6|7|2Y|8|@]|D|@]|E|$]]]|11|$12|$5|13|14|15|E|$16|17]]|18|$5|13|14|15|E|$16|19]]|1A|$5|13|14|15|E|$16|1B]]|1C|$5|13|14|15|E|$16|1D]]|1E|$5|13|14|15|E|$16|1F]]|1G|$5|13|14|15|E|$16|1H]]|1I|$5|13|14|15|E|$16|1J]]|1K|$5|13|14|15|E|$16|1L]]]]

As explained in "<a href="https://stackoverflow.com/a/10346575/6309">gitolite: PTY allocation request failed on channel 0</a>", it is important to do ssh test connection with <code>-T</code>, because some server could abort the transaction entirely if a <a href="http://en.wikipedia.org/wiki/Computer_terminal" rel="noreferrer">text-terminal (tty)</a> is requested.

<code>-T</code> avoids requesting said terminal, since GitHub has no intention of giving you an interactive secure shell, where you could type command. 

GitHub only wants to reply to your ssh request, in order to ascertain that the ssh command does work (you have the right public/private keys, and the public one has been registered to <a href="https://github.com/settings/ssh" rel="noreferrer">your GitHub account</a>)

<a href="http://en.wikipedia.org/wiki/PuTTY" rel="noreferrer">PuTTy</a> would be an example of a <a href="http://en.wikipedia.org/wiki/Terminal_emulator" rel="noreferrer">terminal emulator</a>, <a href="http://en.wikipedia.org/wiki/Serial_console" rel="noreferrer">serial console</a> and network file transfer application. It supports several network protocols, including SCP, SSH, Telnet and rlogin. 
The name "<code>PuTTY</code>" has <a href="http://www.chiark.greenend.org.uk/~sgtatham/putty/faq.html#faq-meaning" rel="noreferrer">no definitive meaning</a>, though "tty" is the name for a terminal in the Unix tradition, usually held to be short for <a href="http://en.wikipedia.org/wiki/Teletype_Corporation" rel="noreferrer">Teletype</a>.

<hr>

<h2>Other use-cases for <code>-T</code> (beside testing)</h2>

<ul>
<li><a href="https://serverfault.com/a/746638/783">Transferring binary files</a></li>
<li><a href="http://unix.stackexchange.com/a/88616/7490">Execute commands on a remote server</a></li>
<li>SSH tunneling: <code>ssh -fnT -L port:server:port user@server</code> (-f for background: you don't want to execute command, don't need a TTY and just want to establish a tunnel)</li>
</ul>

I was trying to setup an SSH connection with Github following this tutorial:
<ul>
<li><a href="https://docs.github.com/en/github/authenticating-to-github/connecting-to-github-with-ssh/testing-your-ssh-connection" rel="noreferrer">Testing your SSH connection</a></li>
</ul>
I came across the following command:
<pre><code>$ ssh -T git@github.com 
# Attempts to ssh to github
</code></pre>
Curious, I looked at the ssh manual. It said the following:
<pre><code> -T Disable pseudo-tty allocation.
</code></pre>
What is tty allocation? What does tty stand for? Why are we disabling it? I earnestly tried to look it up but I was unable to find even a definition.

What is Pseudo TTY-Allocation? (SSH and Github)

服务器

GitHub

Unix

按照本教程，我正在尝试与Github建立SSH连接：我遇到了以下命令：$ ssh -T git@github.com # Attempts to ssh to github出于好奇，我查看了ssh手册。它说了以下内容： -T      Disable pseudo-tty allocation.什么是tty分配？tty...

问什么是伪TTY分配？(SSH和Github)
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