A command language is a language for job control in computing. It is a domain-specific and interpreted language; common examples of a command language are shell or batch programming languages.

A spacecraft command language (or satellite control language, spacecraft control language, Systems Test and Operation Language (STOL), Satellite Test and Operation Language, etc.) is a computer command language for commanding spacecraft mission systems.

Printer Command Language, more commonly referred to as PCL, is a page description language (PDL) developed by Hewlett-Packard as a printer protocol and has become a de facto industry standard. Originally developed for early inkjet printers in 1984, PCL has been released in varying levels for thermal, matrix, and page printers.

<language> /tik*l/ (Tcl) An interpreted string processing language for issuing commands to interactive programs, developed by John Ousterhout at UCB. Each {application program} can extend tcl with its own set of commands. Tcl is like a text-oriented Lisp, but lets you write algebraic expressions for simplicity and to avoid scaring people away. Though originally designed to be a "scripting language" rather than for serious programming, Tcl has been used successfully for programs with hundreds of thousands of lines. It has a peculiar but simple syntax. It may be used as an embedded interpreter in application programs. It has exceptions and packages (called libraries), name-spaces for procedures and variables, and provide/require. It supports dynamic loading of object code. It is {eight-bit clean}. It has only three variable types: strings, lists and associative arrays but no structures. Tcl and its associated GUI toolkit, Tk run on all flavors of Unix, Microsoft Windows, Macintosh and VMS. Tcl runs on the Amiga and many other platforms. Latest version: 8.0.3, as of 1998-09-25. See also expect (control interactive programs and pattern match on their output), Cygnus Tcl Tools, [incr Tcl] (adds classes and inheritence to Tcl), Scriptics (John Ousterhout's company that is the home of Tcl development and the TclPro tool suite), Tcl Consortium (a non-profit agency dedicated to promoting Tcl), tclhttpd (an embeddable Tcl-based web server), tclx (adds many commands to Tcl), tcl-debug. {comp.lang.tcl FAQ at MIT (ftp://rtfm.mit.edu/pub/usenet-by-group/comp.answers/tcl-faq/)}. or at purl.org (http://purl.org/NET/Tcl-FAQ/). {Scriptics downloads (http://scriptics.com/software/download.html)}. Kanji (ftp://srawgw.sra.co.jp/pub/lang/tcl/jp/). Usenet newsgroups: news:comp.lang.tcl.announce, news:comp.lang.tcl. ["Tcl: An Embeddable Command Language", J. Ousterhout, Proc 1990 Winter USENIX Conf]. (1998-11-27)

The Guarded Command Language (GCL) is a programming language defined by Edsger Dijkstra for predicate transformer semantics in EWD472. It combines programming concepts in a compact way.

A command in military terminology is an organisational unit for which a military commander is responsible. Commands, sometimes called units or formations, form the building blocks of a military.

A command hierarchy is a group of people who carry out orders based on others' authority within the group. It can be viewed as part of a power structure, in which it is usually seen as the most vulnerable and also the most powerful part.

A Basic Command Unit (BCU) is the largest unit into which territorial British Police forces are dividedBasic Command Unit replaces the earlier terms Sub-Division and Division that had been in use since the 1880s. BCUs may alternatively be called an Area Command, a Division, a Local Policing Unit (LPU) or a Local Policing Team (LPT).

Command HQ is a real-time strategy world domination game. It was released in 1990 by Microplay Software and was created by designer Danielle Bunten.