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  2. Substitute character - Wikipedia

    en.wikipedia.org/wiki/Substitute_character

    Standard keyboards transmit this code when the Ctrl and Z keys are pressed simultaneously (Ctrl+Z, often documented by convention as ^Z). [1] Unicode inherits this character from ASCII, but recommends that the replacement character ( , U+FFFD) be used instead to represent un-decodable inputs, when the output encoding is compatible with it.

  3. C0 and C1 control codes - Wikipedia

    en.wikipedia.org/wiki/C0_and_C1_control_codes

    In 1973, ECMA-35 and ISO 2022 [18] attempted to define a method so an 8-bit "extended ASCII" code could be converted to a corresponding 7-bit code, and vice versa. [19] In a 7-bit environment, the Shift Out would change the meaning of the 96 bytes 0x20 through 0x7F [a] [21] (i.e. all but the C0 control codes), to be the characters that an 8-bit environment would print if it used the same code ...

  4. Hexspeak - Wikipedia

    en.wikipedia.org/wiki/Hexspeak

    Hexspeak is a novelty form of variant English spelling using the hexadecimal digits. Created by programmers as memorable magic numbers, hexspeak words can serve as a clear and unique identifier with which to mark memory or data. Hexadecimal notation represents numbers using the 16 digits 0123456789ABCDEF.

  5. cmp (Unix) - Wikipedia

    en.wikipedia.org/wiki/Cmp_(Unix)

    In computing, cmp is a command-line utility on Unix and Unix-like operating systems that compares two files of any type and writes the results to the standard output. By default, cmp is silent if the files are the same; if they differ, the byte and line number at which the first difference occurred is reported. The command is also available in ...

  6. ANSI escape code - Wikipedia

    en.wikipedia.org/wiki/ANSI_escape_code

    Operating System Command: Starts a control string for the operating system to use, terminated by ST. [5]: 8.3.89 ESC X: 0x98: SOS: Start of String Takes an argument of a string of text, terminated by ST. [5]: 5.6 The uses for these string control sequences are defined by the application [5]: 8.3.2, 8.3.128 or privacy discipline.

  7. Hex editor - Wikipedia

    en.wikipedia.org/wiki/Hex_editor

    A hex editor (or binary file editor or byte editor) is a computer program that allows for manipulation of the fundamental binary data that constitutes a computer file. The name 'hex' comes from 'hexadecimal', a standard numerical format for representing binary data. A typical computer file occupies multiple areas on the storage medium, whose ...

  8. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.

  9. Delete character - Wikipedia

    en.wikipedia.org/wiki/Delete_character

    The delete control character (also called DEL or rubout) is the last character in the ASCII repertoire, with the code 127. [1] It is supposed to do nothing and was designed to erase incorrect characters on paper tape. It is denoted as ^? in caret notation and is U+007F in Unicode.