Linux Bash

The Linux Bash is also known as 'Bourne-again Shell.' It is a command language interpreter for the Linux based system. It is a replacement of Bourne shell (sh). It was developed under the GNU Project and written by Brian Fox. Nowadays, Bash is the default user shell of most of the Linux distributions.

The Linux/Unix shell allows us to interact with the Linux system through the commands. It let us invoke an executable file to create a running process. Moreover, it also allows us to interact with the Linux file system. It is designed in such a way that we can perform all the Linux operations through Bash.

The Bash is a command language interpreter as well as a programming language. It supports variables, functions, and flow control, like other programming languages. It can also read and execute the commands from a file, which is called a shell script.

It offers various functional improvements over Bourne Shell (sh) for both interactive and programming use. Although many sh scripts can be run by Bash without any change. The Bash contains the following improvements over sh:

• It provides command-line editing
• It contains unlimited size command history
• It provides Job Control
• It facilitates with Shell Functions and Aliases
• It provides the indexed arrays of unlimited size
• It contains integer arithmetic in any base from 2 to 64.