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  2. Print Screen - Wikipedia

    en.wikipedia.org/wiki/Print_Screen

    A 104-key PC US English keyboard layout with Print Scrn circled. Print Screen (often abbreviated Print Scrn, Prnt Scrn, Prnt Scr, Prt Scrn, Prt Scn, Prt Scr, Prt Sc, Pr Sc, or PS) is a key present on most PC keyboards. It is typically situated in the same section as the break key and scroll lock key. The print screen may share the same key as ...

  3. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    Version 1 AT&T UNIX dd: Filesystem Mandatory Convert and copy a file Version 5 AT&T UNIX delta: SCCS Optional (XSI) Make a delta (change) to an SCCS file PWB UNIX df: Filesystem Mandatory Report free disk space Version 1 AT&T UNIX diff: Text processing Mandatory Compare two files; see also cmp Version 5 AT&T UNIX dirname: Filesystem Mandatory

  4. Comparison of open-source operating systems - Wikipedia

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

    Multiserver Microkernel (Hurd kernel) or Monolithic (Linux-libre kernel, fork of Linux kernel, and other kernels which are not part of the GNU Project) C: 1:1 Unix-like: 2.4 on Linux-libre kernel (not on Hurd kernel) Linux: ReactOS: GPL, LGPL Hybrid C, C++ Windows-like: No RISC OS: Apache 2.0 Monolithic (with cooperative multitasking) ARM ...

  5. Source Code Control System - Wikipedia

    en.wikipedia.org/wiki/Source_Code_Control_System

    SCCS was the dominant version control system for Unix until later version control systems, notably the RCS and later CVS, gained more widespread adoption. Today, these early version control systems are generally considered obsolete, particularly in the open-source community, which has largely embraced distributed version control systems.

  6. Comparison of Linux distributions - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_Linux...

    This article may require cleanup to meet Wikipedia's quality standards.The specific problem is: Active distributions composed entirely of free software (Dragora GNU/Linux-Libre, gNewSense, Guix System, LibreCMC, Musix GNU+Linux, Parabola GNU/Linux-libre, and Trisquel) need information in all sub categories, #General is complete.

  7. Load-link/store-conditional - Wikipedia

    en.wikipedia.org/wiki/Load-link/store-conditional

    Real implementations of LL/SC do not always succeed even if there are no concurrent updates to the memory location in question. Any exceptional events between the two operations, such as a context switch , another load-link, or even (on many platforms) another load or store operation, will cause the store-conditional to spuriously fail.

  8. System request - Wikipedia

    en.wikipedia.org/wiki/System_request

    A 104-key PC US English keyboard layout with System request circled. System Request (SysRq or Sys Req) is a key on personal computer keyboards that has no standard use. Introduced by IBM with the PC/AT, it was intended to be available as a special key to directly invoke low-level operating system functions with no possibility of conflicting with any existing software.

  9. Control key - Wikipedia

    en.wikipedia.org/wiki/Control_key

    A Control key (marked "Ctrl") on a Windows keyboard next to one style of a Windows key, followed in turn by an Alt key The rarely used ISO keyboard symbol for "Control". In computing, a Control keyCtrl is a modifier key which, when pressed in conjunction with another key, performs a special operation (for example, Ctrl+C).