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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The RFC specifies this code should be returned by teapots requested to brew coffee. [18] This HTTP status is used as an Easter egg in some websites, such as Google.com's "I'm a teapot" easter egg. [19] [20] [21] Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden. [22] [23]

  3. chmod - Wikipedia

    en.wikipedia.org/wiki/Chmod

    Add write permission (w) to the Group's (g) access modes of a directory, allowing users in the same group to add files: $ ls -ld dir # show access modes before chmod drwxr-xr-x 2 jsmitt northregion 96 Apr 8 12:53 shared_dir $ chmod g+w dir $ ls -ld dir # show access modes after chmod drwxrwxr-x 2 jsmitt northregion 96 Apr 8 12:53 shared_dir

  4. sudo - Wikipedia

    en.wikipedia.org/wiki/Sudo

    As a security and auditing feature, sudo may be configured to log each command run. When a user attempts to invoke sudo without being listed in the configuration file, an exception indication is presented to the user indicating that the attempt has been recorded. If configured, the root user will be alerted via mail. By default, an entry is ...

  5. Type safety - Wikipedia

    en.wikipedia.org/wiki/Type_safety

    In computer science, type safety and type soundness are the extent to which a programming language discourages or prevents type errors.Type safety is sometimes alternatively considered to be a property of facilities of a computer language; that is, some facilities are type-safe and their usage will not result in type errors, while other facilities in the same language may be type-unsafe and a ...

  6. File-system permissions - Wikipedia

    en.wikipedia.org/wiki/File-system_permissions

    When a file with setuid is executed, the resulting process will assume the effective user ID given to the owner class. This enables users to be treated temporarily as root (or another user). The set group ID, setgid, or SGID permission. When a file with setgid is executed, the resulting process will assume the group ID given to the group class ...

  7. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

  8. Memory safety - Wikipedia

    en.wikipedia.org/wiki/Memory_safety

    In 2019, a Microsoft security engineer reported that 70% of all security vulnerabilities were caused by memory safety issues. [7] In 2020, a team at Google similarly reported that 70% of all "severe security bugs" in Chromium were caused by memory safety problems.

  9. Thread safety - Wikipedia

    en.wikipedia.org/wiki/Thread_safety

    This difficult-to-diagnose logic error, which may compile and run properly most of the time, is called a race condition. One common way to avoid this is to use another shared variable as a "lock" or "mutex" (from mutual exclusion). In the following piece of C code, the function is thread-safe, but not reentrant: