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This chapter briefly summarizes the shells building blocks: commands, control structures, shell functions, shell parameters, shell expansions, redirections, which are a way to direct input and output from and to named files, and how the shell executes commands. Bash is largely compatible with sh and incorporates useful features from the Korn shell ksh and the C shell csh. It is intended to be a conformant implementation of the ieee.

Quot;ng can be used to disable special treatment for special characters, to prevent reserved words from being recognized as such, and to prevent parameter expansion. Each of the shell metacharacters (see Definitions) has special meaning to the shell and must be quot;d if it is to represent itself. Filename A string of characters used to identify a file. Job A set of processes comprising a pipeline, and any processes descended from it, that are all in the same process group. Token A sequence of characters considered a single unit by the shell. It is either a word or an operator. Word A sequence of characters treated as a unit by the shell. Bash Reference Manual, table of Contents, this text is a brief description of the features that are present in the Bash shell (version 4.3, 2 February 2014). The Bash home page is u.org/software/bash/. Words may not include unquot;d metacharacters. 3 Basic Shell Features Bash is an acronym for Bourne-Again SHell. The Bourne shell is the traditional Unix shell originally written by Stephen Bourne. All of the Bourne shell builtin commands are available in Bash, The rules for evaluation and quot;ng are taken from the posix specification for the standard Unix shell.