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  2. Yacc - Wikipedia

    en.wikipedia.org/wiki/Yacc

    Yacc (Yet Another Compiler-Compiler) is a computer program for the Unix operating system developed by Stephen C. Johnson.It is a lookahead left-to-right rightmost derivation (LALR) parser generator, generating a LALR parser (the part of a compiler that tries to make syntactic sense of the source code) based on a formal grammar, written in a notation similar to Backus–Naur form (BNF). [1]

  3. xv6 - Wikipedia

    en.wikipedia.org/wiki/Xv6

    xv6 is a modern reimplementation of Sixth Edition Unix in ANSI C for multiprocessor x86 and RISC-V systems. It was created for educational purposes in MIT 's Operating System Engineering course in 2006.

  4. Comparison of open-source operating systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_open-source...

    Name License Kernel type Kernel programming language Kernel thread support OS family Oldest non-EOL version [Note 1]Forks; Linux: GPL version 2 only: Monolithic with modules : C: 1:1 Unix-like

  5. Unix - Wikipedia

    en.wikipedia.org/wiki/Unix

    The Unix system is composed of several components that were originally packaged together. By including the development environment, libraries, documents and the portable, modifiable source code for all of these components, in addition to the kernel of an operating system, Unix was a self-contained software system. This was one of the key ...

  6. Flex (lexical analyser generator) - Wikipedia

    en.wikipedia.org/wiki/Flex_(lexical_analyser...

    Normally the generated scanner contains references to the unistd.h header file, which is Unix specific. To avoid generating code that includes unistd.h, %option nounistd should be used. Another issue is the call to isatty (a Unix library function), which can be found in the generated

  7. tmux - Wikipedia

    en.wikipedia.org/wiki/Tmux

    tmux is an open-source terminal multiplexer for Unix-like operating systems.It allows multiple terminal sessions to be accessed simultaneously in a single window. It is useful for running more than one command-line program at the same time.

  8. Shell script - Wikipedia

    en.wikipedia.org/wiki/Shell_script

    At least three DCL implementations for Windows type operating systems—in addition to XLNT, a multiple-use scripting language package which is used with the command shell, Windows Script Host and CGI programming—are available for these systems as well. Mac OS X and subsequent are Unix-like as well.

  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.