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3 Basic Shell 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, The rules for
evaluation and quoting are taken from the POSIX specification for the
'standard' Unix shell.

   This chapter briefly summarizes the shell's '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.

* Shell Syntax
What your input means to the shell.
* Shell Commands
The types of commands you can use.
* Shell Functions
Grouping commands by name.
* Shell Parameters
How the shell stores values.
* Shell Expansions
How Bash expands parameters and the various expansions available.
* Redirections
A way to control where input and output go.
* Executing Commands
What happens when you run a command.
* Shell Scripts
Executing files of shell commands.

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