This pocket reference covers Bash, particularly version 4.1, the primary shell for GNU/Linux and Mac OS X. Bash is available for Solaris and the various BSD systems, and can be easily compiled for just about any other Unix system.

Cascading Style Sheets (CSS) is the W3C standard for the visual presentation of web pages (although it can be used in other settings as well).

CSS, which stands for Cascading Style Sheets, is a stylistic language that defines how web pages are presented. It complements HTML, which is the language used for describing the structure of web site content. Because HTML predates CSS, it includes a number of limited stylistic elements and attributes, but they have largely been deprecated in favor of the much greater design control offered by CSS.

The C# programming language is an object-oriented language created by Microsoft for the .NET Framework. C# (pronounced “see sharp”) builds on some of the best features of the major programming languages.