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  2. Read–eval–print loop - Wikipedia

    en.wikipedia.org/wiki/Read–eval–print_loop

    A read–eval–print loop (REPL), also termed an interactive toplevel or language shell, is a simple interactive computer programming environment that takes single user inputs, executes them, and returns the result to the user; a program written in a REPL environment is executed piecewise. [1]

  3. 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. Typical operations performed by shell scripts include file manipulation, program execution, and printing ...

  4. Fish (Unix shell) - Wikipedia

    en.wikipedia.org/wiki/Fish_(Unix_shell)

    Fish (or friendly interactive shell- stylized in lowercase) is a Unix-like shell with a focus on interactivity and usability. Fish is designed to be feature-rich by default, rather than highly configurable. [5] Fish is considered an exotic shell since it does not adhere to POSIX shell standards, at the discretion of its maintainers. [6]

  5. Unix shell - Wikipedia

    en.wikipedia.org/wiki/Unix_shell

    tcsh and sh shell windows on a Mac OS X Leopard [1] desktop. A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language, and is used by the operating system to control the execution of the system using ...

  6. rc (Unix shell) - Wikipedia

    en.wikipedia.org/wiki/Rc_(Unix_shell)

    es (for "extensible shell") is an open source, command line interpreter developed by Rakitzis and Paul Haahr [2] that uses a scripting language syntax influenced by the rc shell. [3] [4] It was originally based on code from Byron Rakitzis's clone of rc for Unix. [5] [6]

  7. Conditional (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Conditional_(computer...

    If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.

  8. Conditional loop - Wikipedia

    en.wikipedia.org/wiki/Conditional_loop

    However, infinite loops can sometimes be used purposely, often with an exit from the loop built into the loop implementation for every computer language, but many share the same basic structure and/or concept. The While loop and the For loop are the two most common types of conditional loops in most programming languages.

  9. C shell - Wikipedia

    en.wikipedia.org/wiki/C_shell

    By today's standards, C shell may not seem particularly more C-like than many other popular scripting languages. But through the 80s and 90s, the difference was seen as striking, particularly when compared to Bourne shell (also known as sh), the then-dominant shell written by Stephen Bourne at Bell Labs.