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2. Command pattern - Wikipedia

   en.wikipedia.org/wiki/Command_pattern

   A sample UML class and sequence diagram for the Command design pattern. [3]In the above UML class diagram, the Invoker class doesn't implement a request directly. Instead, Invoker refers to the Command interface to perform a request (command.execute()), which makes the Invoker independent of how the request is performed.

3. Abstract syntax tree - Wikipedia

   en.wikipedia.org/wiki/Abstract_syntax_tree

   An abstract syntax tree (AST) is a data structure used in computer science to represent the structure of a program or code snippet. It is a tree representation of the abstract syntactic structure of text (often source code) written in a formal language. Each node of the tree denotes a construct occurring in the text.

4. "Hello, World!" program - Wikipedia

   en.wikipedia.org/wiki/"Hello,_World!"_program

   program through their software package manager systems, which can be invoked with the command hello. It serves as a sanity check and a simple example of installing a software package. For developers, it provides an example of creating a .deb package, either traditionally or using debhelper , and the version of hello used, GNU Hello , serves as ...

5. Command (computing) - Wikipedia

   en.wikipedia.org/wiki/Command_(computing)

   The following command displays the contents of the file readme.txt. The program name is type and the argument is readme.txt. [6] type readme.txt The following command lists the contents of the current directory. The program name is dir, and Q is a flag requesting that the owner of each file also be listed. [7] dir /Q

6. Five paragraph order - Wikipedia

   en.wikipedia.org/wiki/Five_paragraph_order

   The five paragraph order or five paragraph field order is a style of organizing information about a military situation for a unit in the field. It is an element of Canadian Army, United States Army, United States Marine Corps and United States Navy Seabees small unit tactics, and similar order styles are used by military groups around the world.

7. Outline (list) - Wikipedia

   en.wikipedia.org/wiki/Outline_(list)

   An outline, also called a hierarchical outline, is a list arranged to show hierarchical relationships and is a type of tree structure. An outline is used [1] to present the main points (in sentences) or topics of a given subject. Each item in an outline may be divided into additional sub-items.

8. Imperative programming - Wikipedia

   en.wikipedia.org/wiki/Imperative_programming

   The 'new' command created an empty slate; Statements evaluated immediately; Statements could be programmed by preceding them with a line number; The 'list' command displayed the program; The 'run' command executed the program; However, the Basic syntax was too simple for large programs. [8] Recent dialects added structure and object-oriented ...

9. Control flow - Wikipedia

   en.wikipedia.org/wiki/Control_flow

   For example, a program might contain several calls to read files, but the action to perform when a file is not found depends on the meaning (purpose) of the file in question to the program and thus a handling routine for this abnormal situation cannot be located in low-level system code.