Information about Caret Notation
Caret notation is a notation for unprintable control characters in ASCII encoding. The notation consists of a caret (^) followed by a capital letter; this digraph stands for the ASCII code that has the numerical value equivalent to the letter's numerical value. For example, ^D represents the end-of-transmission character (abbrevated EOT), which cannot ordinarily be shown on the screen. The letter is D, because it is the 4th letter in the alphabet and EOT has the value 4 in the ASCII encoding. The null character (NUL) is represented as ^@ (@ is the ASCII character before A).
For a complete list of caret notation, see C0 and C1 control codes.
Many computer systems allow you to enter a control character by holding down Ctrl and pressing the letter used in the caret notation. This is practical, because many control characters (e.g. EOT) can not be entered directly from a keyboard. Although there are many ways to represent control characters, this correspondence between notation and typing makes the caret notation suitable for many applications.
Caret notation is used in many programs, particularly Unix-viewers such as less and screen.
An alphabet is a standardized set of letters
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For a complete list of caret notation, see C0 and C1 control codes.
Many computer systems allow you to enter a control character by holding down Ctrl and pressing the letter used in the caret notation. This is practical, because many control characters (e.g. EOT) can not be entered directly from a keyboard. Although there are many ways to represent control characters, this correspondence between notation and typing makes the caret notation suitable for many applications.
Caret notation is used in many programs, particularly Unix-viewers such as less and screen.
In computing and telecommunication, a control character or non-printing character is a code point (a number) in a character set that does not in itself represent a written symbol.
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American Standard Code for Information Interchange (ASCII), generally pronounced ask-ee IPA: /ˈæski/ ( [1] ), is a character encoding based on the English alphabet.
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In telecommunication, an end-of-transmission character (EOT) is a transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message headings.
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- ABCs redirects here, for the Alien Big Cats, see British big cats.
An alphabet is a standardized set of letters
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American Standard Code for Information Interchange (ASCII), generally pronounced ask-ee IPA: /ˈæski/ ( [1] ), is a character encoding based on the English alphabet.
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The null character (also null terminator) is a character with the value zero, present in the ASCII and Unicode character sets, and available in nearly all mainstream programming languages.
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at sign (@, read aloud in English as "at") is a typographic symbol used as an abbreviation for "at" in accounting and commercial invoices, in statements such as "7 widgets @ $2 ea. = $14". More recently, the at symbol has become ubiquitous because of its use in e-mail addresses.
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The C0 and C1 control code sets define control codes for use in text. C0, originally defined in ISO 646, defines codes in the range 00HEX–1FHEX. C1, originally defined in ISO 6429, defines codes in the range 80HEX–9FHEX.
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Control key is a modifier key which, when pressed in conjunction with another key, will perform a special operation (for example, Control-Alt-Delete); similar to the Shift key, the Control key rarely performs any function when pressed by itself.
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Unix (officially trademarked as UNIX®) is a computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie and Douglas McIlroy.
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less is a program on Unix and Unix-like systems used to view (but not change) the contents of a text file one screen at a time. It is similar to more, but has the extended capability of allowing both forward and backward navigation through the file.
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Maintainer: GNU Project
OS: Unix-like
Use: Command line interface
License: GPL
Website: www.gnu.org/software/screen GNU Screen is a free terminal multiplexer developed by the GNU Project.
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OS: Unix-like
Use: Command line interface
License: GPL
Website: www.gnu.org/software/screen GNU Screen is a free terminal multiplexer developed by the GNU Project.
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