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Reference notes.
A reference card or reference sheet (or quick reference card) or crib sheet is a concise bundling of condensed notes about a specific topic, such as mathematical formulas[1] to calculate area/volume, or common syntactic rules and idioms of a particular computer platform, application program, or formal language. It serves as an ad hoc memory aid for an experienced user.[2]
Vi Reference Card Modes Vi has two modes: insertion mode, and command mode. The editor begins in command mode, where cursor move-ment and text deletion and pasting occur. Insertion mode begins upon entering an insertion or change command. ESC returns the editor to command mode (where you can quit, for example by typing:q!). Most commands execute. VI to fit an application, or you can copy and paste from one or more examples into a VI you create. Web Resources. Quick Reference Card.
In spite of what the name reference card may suggest, such as a 3x5 index card (8 cm × 13 cm), the term also applies to sheets of paper or online pages, as in the context of programming languages or markup languages. However, this concept is now being adopted to portray concise information in many other fields.
Appearance[edit]
- Title: Vim Quick Reference Card Author: Michael Goerz Subject: Vim Text Editor Keywords: Movements, Insertion, Replace and Deletion, Insert Mode, Search.
- Bourne Shell Quick Reference Card II I. Introduction to Shell Scripts A. The shell is the program that you run when you log in B. It is a command interpreter C. SYS=`hostname`There are three standard shells - C, Korn and Bourne D. FShell prompts users, accepts command, parses, then interprets command.
As in the examples below, reference cards are typically one to a few pages in length. Pages are organized into one or more columns. Across the columns, the reference is split into sections and organized by topic. Each section contains a list of entries, with each entry containing a term and its description and usage information. Terms might include keywords, syntactic constructs, functions, methods, or macros in a computer language. In a reference card for a program with a graphical user interface, terms may include menu entries, icons or key combinations representing program actions.
Due to its logical structure and conciseness, finding information in a reference card is trivial for humans and requires no computer interaction. It is therefore convenient for a user to print out a reference card. While reference cards can be printed on card stock, it is common to print them on ordinary printer paper. With the advent of portable electronic devices that can display documents, digital reference cards stored in PDF or HTML formats have become more common. This is in contrast to user guides, which tend to be rather long and verbose and which have (in comparison to reference cards) a lower information density
Examples[edit]
- Wikimedia wiki syntax ref card meta:Help:Reference card
- A LaTeX reference sheet: PDF
- An AMS LaTeX reference card: PDF
- An R reference card: PDF
- An R reference card for data mining: www.rdatamining.com
See also[edit]
References[edit]
- ^ 'DC CAS Math Formula Reference Card | osse'. Washington, D.C., webpage: OSSE-refcard.
- ^'IBM System/360 and System/370 reference cards'.
Technicians and operators carried cards with commonly needed information culled from the many reference manuals for each computer. A “green card” in your shirt pocket announced that you were an assembly-language programmer.
External links[edit]
- Collection of reference cards
Vi Quick Reference Guide
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