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This text is a brief description of the features that are present in the Bash shell (version 4.4, 7 September 2016). This is Edition 4.4, last updated 7 September 2016, of ).The following menu breaks the features up into categories, noting which features were inspired by other shells and which are specific to Bash.This manual is meant as a brief introduction to features found in Bash.
At its base, a shell is simply a macro processor that executes commands.
The term macro processor means functionality where text and symbols are expanded to create larger expressions.
A Unix shell is both a command interpreter and a programming language.
As a command interpreter, the shell provides the user interface to the rich set of utilities.
The constructs permit fine-grained control of the input and output of those commands.