BASH is the shell, otherwise known as command-line interpreter, of the GNU
system. It remains to be compatible with the Bourne Shell, but integrates
helpful features from the Korn Shell and the C Show, as well as incorporating
new improvements of its own.
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The software was first released in 1989, and is now the default for most Linux distributions and Apple’s MacOS, and is now available for Windows 10.
Essentially, it is a command processor that typically runs in a text window, where the user types commands that lead to actions. The system enables command-line editing, an unlimited size command history, shell functions and aliases, and job controls while maintaining the allowance of most scripts to be run without any modification.
Other improvements include indexed arrays of unlimited size and an integer arithmetic in any base from two to sixty-four.