What Is A Tty Linux

What Is A Tty Linux – If you’ve been using Linux for a while, you’ve probably heard the terms TTY and PTY. This article will explain what they are, how they affect Linux users, and their sweet little history.

The teleprinter was an electronic device that allowed you to send and receive text messages over a wire (one-to-one) as an alternative to Morse code.

What Is A Tty Linux

Unlike Morse code, Teleprinters required one trained operator to transmit the message, making it possible to send messages between countries without interference (very effective for World War II spies).

Terminal, Shell, Tty, Consola: ¿son Lo Mismo?

However, this device did not use the keyboard until Donald Murray introduced his first development of the typewriter keyboard in late 1901, which made it much easier to punch paper tape or transfer data from punched tape. and forwarded to the publication he was receiving.

This development reduced the combination of simple codes to the most commonly used characters (the origin of the QWERTY keyboard), making it easier for operators to send messages.

Additionally, in 1908, a working teleprinter was developed by the Morkrum Company as a field test; Later, as this technology developed, the Morkrum Company introduced the first commercial Teletypewriter (also known as TTY) system in 1910.

The difference between a typewriter and a teletypewriter is that a typewriter is used to type letters, while a teletypewriter is a keyboard attached to a communication device (or general device that can accept keyboard input) to send written messages.

A Truetype Font In A Tty: Glass_tty

To understand the involvement of computers (or Linux systems), you need to know that “TTY” refers to a communication device or any computer device that accepts computer input. So let’s continue…

The teletypewriter was ahead of its time, before the semiconductor transistors used to build microprocessors hit the market.

However, when the computer arrived, they did not automatically adopt the keyboard as an input method, but used punch cards.

When computers became popular, people started using teletypewriters to communicate with these devices.

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Gradually, more intelligent people became involved in the development of computer devices, replacing the old TTY technology (introduced by the Morkrum company) with the short TTY (using electronic devices).

At the same time, a visual terminal was added to the TTY because at first things were printed on paper instead of displayed on the screen. That’s why you hear the words “printing” in paper printing and “displaying” in screen display.

As the video terminal (not the Linux Terminal, the physical terminal mentioned above) improved, software that behaved like them came out with more features and functions. Hence the term “terminal replacements”, now used for programs such as GNOME Terminal, Konsole, Terminator, etc.

A video terminal was a physical (or video) terminal, also called a TTY, that accepted keyboard input and displayed a screen. Terminal emulators are programs within an operating system that take input from a computer and display output on a terminal screen.

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Linux is also a computing device that accepts the keyboard as input and displays output on the screen (which properly falls under the definition of TTY).

As Linux development progressed, more features were added, such as multitasking and desktop GUI, so now you have to use PTY (pseudo-terminal, a child of TTY) using a computer terminal.

So whenever you start a terminal compiler (like Gnome Terminal or Konsole), it comes with an attached PTY (which runs under the TTY shader) to help you communicate with the kernel.

However, the original (or parent) TTY is still found in Linux, which is a computer system that can be used to switch between multiple consoles (or TTYs) to perform multiple tasks.

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TTY has two meanings: one is the serial port of the computer that the terminal is connected to, and the other is the console (or TTY) that allows you to communicate with your system.

In Linux, there are six consoles, or TTYs, and accessing them is very easy with a few key combinations, and you may have already interacted with them.

Note: The following key combination depends on the system; Different systems may behave differently from the following, so it is better to check your OS configuration. However, I used Ubuntu as an example to cover the large audience.

As you can see, you have a total of six TTY screens, two of which are used to connect the screen or switch desktops, and four video consoles.

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The advantage of having multiple consoles is that you can multitask easily; For example, you can start TTY3 using the key “CTRL + ALT + F3” and update your system, while it is updating, start TTY4 using the key “CTRL + ALT + F4” to continue working while the system is updating. updated.

Note: You can easily switch between all TTY screens using keyboard shortcuts or the chvt command.

So you get a complete command line to interact with your kernel with these virtual consoles (or TTYs).

The question of why you should have it is very legitimate for the average or normal user, because you already have advanced systems with a good desktop environment and you can easily interact with consoles using a terminal emulator .

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However, TTY makes more sense when you suddenly remove it from your desk; at that time, there is only the TTY screen left, which gives you a full-line interface to restore the system.

Another use case might be recovering from an injured back (or lift) or recovering from a frozen work environment.

Even if you are a system (or network) administrator who simply interacts with a line interface and does not need a desktop environment, then TTY can be a good choice because it uses less disk space and system resources, which indirectly improving. performance of your system.

In Linux, everything is represented as a file, even your hardware devices such as hard drives, which are attached to a file in the “/dev/” path. Also, your terminal also represents a file whose path can be examined using the tty command.

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If you are connected via SSH, then you can use the command to get a working tty.

Even commands that run on your terminal use TTY; which can be checked using the ps command.

So, I hope this article helps you understand the concept of TTY in Linux. In case anything is missed or omitted and should have been added, please let us know in the comments section. . It only takes a minute to register.

In the middle of the screen below, you see why I see the use of this. (On the red line, just below the yellow line you only have to write a new text, which will replace the text of the text you didn’t edit (really). So I thought it could be fixed by simply pasting the old text into the tty : if the user hits enter, no changes are made. (This program is written in Perl/MySQL, but I thought it would be more interesting to ask for a general solution than “how to do this”. Perl”.)

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Here’s the Perl code, which uses the C code below (it works exactly as intended), as well as a new screenshot – hope this clears things up no doubt 🙂 Again, look at the middle on the screen, where the editing is done next to the text of the text – this time, the previous text is there, for example, if you want to fix the text, you don’t need to rewrite the whole text.

A terminal doubles as two things: an input device (like a keyboard) and a display device (like a monitor). When you read from the terminal, you get what is coming from the input device. When you type in the terminal, the data goes to the display device.

There is no general way to force input to the terminal. It is rarely necessary to do this. If you need to interact with a program that requires a terminal, use a dedicated terminal emulator like Expect or Empty, or a terminal shell like Screen or Tmux. You can force input to the Linux console with an ioctl. You can force input in E11 terminal emulator with tools like xdotool or xmacro.

At least Linux and BSD have a TIOCSTI ioctl to return characters to the terminal input buffer (up to the [4096 character Linux] limit):

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Solution. The comments and command name are incorrect because TIOCSTI works for any terminal, not just VTs.

By clicking “Accept all cookies”, you agree that Stack Exchange may store cookies on your device and provide information in accordance with our Cookie Policy.TTY stands for TeleTYpe. If you Google the word teletype, an image of a typewriter-like device will appear. How the machine has become an indispensable part