(features.info)Bourne Shell Features

Bourne Shell Style Features
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   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, and the rules
for evaluation and quoting are taken from the Posix 1003.2
specification for the `standard' Unix shell.

   This section briefly summarizes things which Bash inherits from the
Bourne shell: shell control structures, builtins, variables, and other
features.  It also lists the significant differences between Bash and
the Bourne Shell.



* Looping Constructs
Shell commands for iterative action.
* Conditional Constructs
Shell commands for conditional execution.
* Shell Functions
Grouping commands by name.
* Bourne Shell Builtins
Builtin commands inherited from the Bourne
Shell.
* Bourne Shell Variables
Variables which Bash uses in the same way
as the Bourne Shell.
* Other Bourne Shell Features
Addtional aspects of Bash which behave in
the same way as the Bourne Shell.