Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computing, Pic is a domain-specific programming language by Brian Kernighan for specifying diagrams in terms of objects such as boxes with arrows between them. The pic compiler translates this description into concrete drawing commands. Pic is a procedural programming language, with variable assignment, macros, conditionals, and looping. The language is an example of a little language originally intended for the comfort of non-programmers in the Unix environment (Bentley 1988). Pic was first implemented, and is still most typically used, as a preprocessor in the troff document processing system. The pic preprocessor filters a troff document, replacing diagram descriptions by concrete drawing commands, and passing the rest of the document through without change.

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