Bash is an sh-compatible command language interpreter that executes commands read from the standard input or from a file.

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https://linux.die.net/man/1/bash

 

bash - GNU Bourne-Again SHell

Description

Bash is an sh-compatible command language interpreter that executes commands read from the standard input or from a file. Bash also incorporates useful features from the Korn and C shells (ksh and csh).

Bash is intended to be a conformant implementation of the Shell and Utilities portion of the IEEE POSIX specification (IEEE Standard 1003.1). Bash can be configured to be POSIX-conformant by default.

 

https://www.gnu.org/software/bash/

Bash is the GNU Project's shell. Bash is the Bourne Again SHell. Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh). It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It offers functional improvements over sh for both programming and interactive use. In addition, most sh scripts can be run by Bash without modification.

The improvements offered by Bash include:

• Command line editing
• Unlimited size command history
• Job Control
• Shell Functions and Aliases
• Indexed arrays of unlimited size
• Integer arithmetic in any base from two to sixty-four