The encoding has traditionally been either ASCII, one of its many derivatives such as ISO/IEC 646 etc., or sometimes EBCDIC.
Unicode is today gradually replacing the older ASCII derivatives limited to 7 or 8 bit codes.
type
(DOS and Windows) and cat
(Unix), but also for more complex activities like web browsers, i.e. Lynx and the Line Mode Browser.
Plain text files are almost universal in programming; a source code file containing instructions in a programming language is almost always a plain text file. Plain text is also commonly used for configuration files, which are read for saved settings at the startup of a program.
Plain text is the original and ever popular method of conveying e-mail. HTML formatted e-mail messages often include an automatically generated plain text copy as well, for compatibility reasons.
When data transfer became more stable, the 8th bit stopped being used as a checksum and was used to extend the character set by another 128 characters; these non-standard characters were encoded differently in different countries, and in a way that made multilingual texts impossible to encode. For instance, a browser may display ¬A rather than ` if it tries to interpret one character set as another.
At last Unicode was defined, which currently allows for 1,114,112 code values used for any modern text writing system and a lot of extinct ones, and is universal. For example, Unicode encodes characters for Chinese, Hebrew, and Cyrillic as well as Latin. Some of these text formats may be quite complicated to process correctly, but they still contain no structural data, such as bold start and end markers, and are therefore plain text.
SPACE
(= 32
= 20H
) are not intended as displayable characters, but instead as control characters. They are used for diverse interpreted meanings. For example, the code NULL
(= 0
, sometimes denoted Ctrl-@
) is used as string end markers in the programming language C and successors. Most troublesome of these are the codes LF
(= LINE FEED
= 10
= 0AH
) and CR
(= CARRIAGE RETURN
= 13
= 0DH
). Windows and OS/2 require the sequence CR,LF
to represent a newline, while Unix and relatives use just the LF, and Classic Mac OS (but not Mac OS X) uses just the code CR
. This was once a slight problem when transferring files between Windows and Unices, but today most computer programs treat this seamlessly.
See also
Plaintext, most commonly used in a cryptographic context
Cleartext usually refers to lack of protection from eavesdropping
E-text
MIME Content-type
Binary file
Text file
Editor wars
Source code
Category:Computer file formats
cs:Čistý text
de:Plain text
el:Απλό κείμενο
fa:نوشته ساده
fr:Fichier texte
id:Berkas ASCII
nl:Platte tekst
ja:プレーンテキスト
no:Ren tekst
pl:Tekst jawny
pt:Texto plano
ru:Текстовые данные
th:เพลนเท็กซ์
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