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,
and the rules for evaluation and quoting are taken from the POSIX
1003.2 specification for the `standard' Unix shell.
This chapter briefly summarizes the shell's `building blocks':
commands, control structures, shell functions, shell parameters,
redirections, which are a way to direct input and output from
and to named files, and how the shell executes commands.