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  2. write (system call) - Wikipedia

    en.wikipedia.org/wiki/Write_(system_call)

    The write is one of the most basic routines provided by a Unix-like operating system kernel. It writes data from a buffer declared by the user to a given device, such as a file. This is the primary way to output data from a program by directly using a system call. The destination is identified by a numeric code.

  3. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    Estimate file space usage Version 1 AT&T UNIX echo: Shell programming Mandatory Write arguments to standard output Version 2 AT&T UNIX ed: Text processing Mandatory The standard text editor PDP-7 UNIX env: Misc Mandatory Set the environment for command invocation System III ex: Text processing Optional (UP) Text editor 1BSD expand: Text ...

  4. Text file - Wikipedia

    en.wikipedia.org/wiki/Text_file

    Prior to the advent of macOS, the classic Mac OS system regarded the content of a file (the data fork) to be a text file when its resource fork indicated that the type of the file was "TEXT". [7] Lines of classic Mac OS text files are terminated with CR characters. [8] Being a Unix-like system, macOS uses Unix format for text files. [8]

  5. Text editor - Wikipedia

    en.wikipedia.org/wiki/Text_editor

    A text editor is a type of computer program that edits plain text. An example ... on Unix and Linux ... Most word processors can read and write files in plain text ...

  6. Shell script - Wikipedia

    en.wikipedia.org/wiki/Shell_script

    Editing a FreeBSD shell script for configuring ipfirewall. A shell script is a computer program designed to be run by a Unix shell, a command-line interpreter. [1] The various dialects of shell scripts are considered to be command languages.

  7. File-system permissions - Wikipedia

    en.wikipedia.org/wiki/File-system_permissions

    For the sticky or text attribute, in the third triad, the x becomes t and the -becomes T. Here is an example: -rwsr-Sr-t: a file whose user class has read, write and execute permissions; whose group class has read permission; whose others class has read and execute permissions; and which has setuid, setgid and sticky attributes set.

  8. List of GNU Core Utilities commands - Wikipedia

    en.wikipedia.org/wiki/List_of_GNU_Core_Utilities...

    Copies a file or directory dd: Copies and converts a file df: Shows disk free space on file systems dir: Is exactly like "ls -C -b". (Files are by default listed in columns and sorted vertically.) dircolors: Set up color for ls: install: Copies files and set attributes ln: Creates a link to a file ls: Lists the files in a directory mkdir ...

  9. vi (text editor) - Wikipedia

    en.wikipedia.org/wiki/Vi_(text_editor)

    vi (pronounced as distinct letters, / ˌ v iː ˈ aɪ / ⓘ) [1] is a screen-oriented text editor originally created for the Unix operating system. The portable subset of the behavior of vi and programs based on it, and the ex editor language supported within these programs, is described by (and thus standardized by) the Single Unix Specification and POSIX.