From Wikipedia, the free encyclopedia. Look up TTY in Wiktionary, the free dictionary. TTY may refer to: Communications [ edit ] Teleprinteralso called a teletypewriter TTYan electromechanical typewriter paired with a communication channel Telecommunications device for the deaf TDDa teleprinter designed for persons with hearing or speech difficulties Text terminalteleprinter replacement, a serial computer interface for text entry and display Terminal emulatorteleprinter replacement, a program that emulates a video terminal within some other display architecture getty Unix ; the so-called TTYs on Linux, allowing switching between X window system and command-line interface tty unixa command on Linux terminal Other uses [ edit ] Tampere University of Technology Tampereen Teknillinen Yliopistoin Finland Torque-to-yield fastener Disambiguation page providing links to topics that could be referred to by the same search term.
It only takes a minute to sign up. As Danny has stated tty is teletype terminals. The fact is that most of us have used it many times, but few of us have gone so far as to understand it. Here is a very good article which gives us a basic understanding of TTYs in Linux.
tty(4) - Linux man page
The TTY Demystified. This is likely to be a reference to teletype terminals, which would have been used in the early ish days of computers. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
Asked 9 years, 3 months ago. Active 1 month ago. Viewed 82k times. Where did the terminology "tty" come from in Linux? Sen 8, 16 16 gold badges 52 52 silver badges 64 64 bronze badges. Renjith G Renjith G 4, 12 12 gold badges 37 37 silver badges 48 48 bronze badges. Active Oldest Votes.
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What does the tty command do? That takes a bit more explaining. In the s and s, machines known as teleprinters were developed. The messages were typed by the sender on a keyboard of sorts.
They were printed on paper at the receiving end. Messages were encoded and transmitted, then received, decoded, and printed. There were several techniques used to encode and decode the messages. The operator was required to learn a particular key combination for each letter.
Eventually, the Baudot encoding system was coupled to a traditional keyboard layout. To mark that advancement, the machines were named teletypewriters. This was shortened to teletypes and eventually to TTYs. Despite the invention and widespread use of the telephone, teletypes were still going strong.
They were the principal means of transmitting written messages in the period following World War II up to the fax machine boom of the s. Computers were evolving too. They were becoming capable of interacting with users in real time, and of supporting multiple users. The old batch method of working became insufficient. Making stacks of punched cards and waiting overnight for results was no longer acceptable. People needed a device that would allow them to enter instructions and get results sent back to them.
People wanted efficiency.A computer terminal is an electronic or electromechanical hardware device that is used for entering data into, and displaying or printing data from, a computer or a computing system.
The acronym CRT  cathode-ray tubewhich once referred to a computer terminal,  has come to refer to a type of screen of a personal computer. Early terminals were inexpensive devices but very slow compared to punched cards or paper tape for input, but as the technology improved and video displays were introduced, terminals pushed these older forms of interaction from the industry.
A related development was timesharing systems, which evolved in parallel and made up for any inefficiencies of the user's typing ability with the ability to support multiple users on the same machine, each at their own terminal. The function of a terminal is confined to display and input of data; a device with significant local programmable data processing capability may be called a "smart terminal" or fat client.
A terminal that depends on the host computer for its processing power is called a " dumb terminal "  or a thin client. The terminal of the first working programmable, fully automatic digital  Turing-complete  computer, the Z3had a keyboard and a row of lamps to show results. Although at that time "paper was king"   the speed of interaction was relatively limited.
Nevertheless, they quickly became extremely popular Input-Output devices on many different types of computer system once several suppliers gravitated to a set of common standards:. The Datapoint from Computer Terminal Corporation was announced in and shipped inmaking it one of the earliest stand-alone display-based terminals. It solved the memory space issue mentioned above by using a digital shift-register designand using only 72 columns rather than the later more common choice of The great majority of terminals were monochrome, manufacturers variously offering green, white or amber and sometimes blue screen phosphors.
Amber was claimed to reduce eye strain. Terminals with modest color capability were also available but not widely used; for example, a color version of the popular Wyse WY50, the WY, offered 64 shades on each character cell.
An "intelligent" terminal  does its own processing, usually implying a microprocessor is built in, but not all terminals with microprocessors did any real processing of input: the main computer to which it was attached would have to respond quickly to each keystroke. The term "intelligent" in this context dates from Most terminals were connected to minicomputers or mainframe computers and often had a green or amber screen.
Typically terminals communicate with the computer via a serial port via a null modem cable, often using an EIA RS or RS or RS or a current loop serial interface. In fact, the instruction design for the Intel was originally conceived at Computer Terminal Corporation as the processor for the Datapoint From the introduction of the IBMand the DEC VTthe user and programmer could notice significant advantages in VDU technology improvements, yet not all programmers used the features of the new terminals backward compatibility in the VT and later Televideo terminals, for example, with "dumb terminals" allowed programmers to continue to use older software.
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On the Wikipedia's article Computer terminal under the hard copy terminals section of the article it says this "Early user terminals connected to computers were electromechanical teleprinters or teletypewriters TeleTYpewriter, TTY So does TTY stand for teletypewriters?
But it doesn't make any sense for me because I have never seen it and have no idea what "tele" means.Virtual Terminal (TTY) and X Session - Linux
Early user terminals connected to computers were electromechanical teleprinters or teletypewriters TeleTYpewriter, TTYand since then TTY has continued to be used as the name for the text-only console although now this text-only console is a virtual console not a physical console. In Ubuntu Ubuntu Pressing a key sends a character down the serial link. Incoming characters on the serial link are printed on the printer. So when you type lsyou get a hardcopy of the file listing. Yes, the origin of TTY in Unix is from teletypewriter.
The tele in telephone, teletypewriter, etc comes from a Greek root meaning far or distant. Timeshare systems pre-Unix developed physical terminals that allowed you to interact with share the computer during your scheduled time. These terminals meant you did not have to be physically in front of the computer to use it. You could also send output to a teletypewriter, that would print the output at that location. This was the existing physical infrastructure when Unix was developed, so it was natural to use it for Unix networking.
Emulation in virtual or software terminals of the features in physical terminals prevented older code or network infrastructure from breaking. It's this origin in physical terminals and ultimately the machines origins in the telgraph distant writing system and their use of control codes that accounts for certain terminal standards today.
These include the standard 80 character width and the carriage return and linefeed codes. The first printing telegraph machine was patented in Various companies continued developing them, and the word "Teletype" was first trademarked in Source: en. So these machines had seen almost years of development before the first computers, and were the obvious choice for a human-interface device.
There were more expensive terminals, but Teletypes were usually the cheapest and most reliable choices. So when they started working on a terminal device handler for Unix, why would they use anything else? I thought TTY was handed down from the ancients, this is heresy!
In the later days of the teletypes, it was adopted by the deaf community as a form of communications. Nowdays, it's fast becoming ancient as deaf people use video relays to communicate. So, back in the day.Linux operating system represents everything in a file system, the hardware devices that we attach are also represented as a file. The terminal is also represented as a file.
There a command exists called tty which displays information related to terminal. The tty command of terminal basically prints the file name of the terminal connected to standard input. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.
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TTY's are text-only terminals commonly used as a way to get access to the computer to fix things, without actually logging into a possibly b0rked desktop. Related: What is tty7 in the commandline? A tty, short for teletype and perhaps more commonly called a terminalis a device which lets you interact with the system by sending and receiving data, such as commands and the output they produce.
There is also a tty command, which shows the device node of the terminal in which it is running or prints "not a tty" if it is not running inside a terminal; yes, it is possible to run commands outside a terminal. For example:. However, when I run ssh host command to run a command on a remote host, the command is not run inside a terminal.
Here is the relevant part of the manpage man chvt :. The corresponding screen is created if it did not exist yet. This is very helpful for an environment like Ubuntu Server. In Ubuntu Server You can see your tty by logging out from Ubuntu Server run logout and see up at the top Ubuntu Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top.
Home Questions Tags Users Unanswered. What is a tty, and how do I access a tty? Ask Question. Asked 8 years, 6 months ago. Active 1 year, 4 months ago.
Viewed k times. I keep hearing about these things known as tty 's. Here is the link that should answer your question: askubuntu. Active Oldest Votes. By default Ubuntu has 7 tty's. Up until Ubuntu On Ubuntu Sir you have mentioned " to F1-F6 to access the terminal that you need"how they are different and how to use them as per to need ,what kind of need is supported to which terminal. I dont know if it is the right place but your question and answer pointed it for me.
Karl Richter 4, 11 11 gold badges 46 46 silver badges 80 80 bronze badges. JulienBu JulienBu 31 2 2 bronze badges. This is the equivalent of having two tabs open in a GUI Environment.