Bash
bash(1) (Bourne-Again Shell) is a sh(1)-compatible shell with greatly expanded syntax.
Contents
Installation
Most Linux and BSD distributions offer a bash package. bash(1) is pre-installed and pre-configured as the login shell for many Linux distributions.
MacOS formerly used bash(1) as the login shell.
Language
See also
Bash Reference Manual, the GNU reference document
BashFAQ on Greg's Wiki