Bash, but generally are not capitalized, is an acronym for "Bourne-Again Shell" and is named after Stephen Bourne, the creator of the Unix shell "sh". It is a command language interpreter derived from sh can execute commands entered on input speed control and process text file.
Bash (bash) supports all commands of the original Bourne shell (sh), and many others. It also includes features of the Korn shell (ksh) and C shell (csh), such as command line editing, command syntax substitution, and command history. Bash also supports "the development braces," which is used to generate strings of related text. This operation provides an efficient way to search for file names and rename multiple files. Newer versions of Bash support regular expressions (Bash 3.0) and associative arrays (Bash 4.0).
Bash was originally developed by Brian Fox for the GNU project and was published in 1989. The bash was first distributed with the GNU operating system and later became the default shell for many Linux distributions and Mac OS X. The latest versions of Bash (versions 3 and 4) were developed by Chet Ramey and are currently published by the Free Software Foundation, the organization that distributes the GNU operating system