What do tty and pts mean in Linux?

The tty in Linux represents the name of the terminal device. It is a character device and has multiple types; pts refers to the pseudo terminal. When a terminal is opened, it is pts/0. When a terminal is opened again, j is pts

In the Linux system, when we enter a letter, we can see output like tty1, pts/0 through ps, who and other commands. Today we will introduce the functions of these two in the article. They have It has a certain reference effect and I hope it will be helpful to everyone

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tty introduction:

tty is the collective name for terminal equipment. It is a character-type device and has many types. Therefore, tty is usually used to refer to various types of terminal devices.

pts introduction:

pts refers to the so-called pseudo terminal or virtual terminal. When you open a terminal, the name of the terminal is pts /0, but when you open a terminal again, this

new terminal is called pts

Under the Linux system, put the device name in the special file directory /dev, the terminal is special Device files generally include the following types

(1) Serial port terminal (/dev/ttySn)

It is a terminal device connected using a computer port, and each serial port is Treated as a character device. If you want to send data to a port, you can redirect the standard output to these special file names on the command line

(2) Pseudo terminal (/dev/pty/)

are pairs of logical terminal devices, such as /dev/ptyp3 and /dev/ttyp3, which are not directly related to actual physical devices.

(3) Control terminal (/dev/tty)

If the current process has a control terminal, then /dev/tty is the device special file of the control terminal of the current process. You can use the command "ps -ax" to see which control terminal the process is connected to. If you are logging in from a shell, then /dev/tty is the terminal you are using. Use the command "tty" to check which actual terminal device it corresponds to.

(4) Console terminal (/dev/ttyn, /dev/console)

In UNIX systems, the computer monitor is usually called the console terminal. It emulates a type of Linux terminal and has some device special files associated with it. You can also log in to different virtual terminals, so the system can have several different sessions at the same time. Only the system or super user root can write to /dev/tty0.

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