Answer Posted / abhay saxena
The Bourne shell is the original Unix shell (command
execution program, often called a command interpreter) that
was developed at AT&T.Bourne Again Shell (bash) is the free
version of the Bourne shell distributed with Linux systems.
Bash is similar to the original, but has added features such
as command line editing. Its name is sometimes spelled as
Bourne Again SHell.
&
C shell (csh) is a Unix shell developed by Bill Joy for the
BSD Unix system. It was originally derived from the 6th
Edition Unix /bin/sh (which was the Thompson shell), Its
syntax is modeled after the C programming language. The C
shell added many feature improvements over the Bourne
shell, such as aliases and command history. Today, the
original C shell is not in wide use on Unix; it has been
superseded by other shells such as the Tenex C shell (tcsh)
based on the original C shell code, but adding filename
completion and command line editing, comparable with the
Korn shell (ksh), and the GNU Bourne-Again shell (bash). An
independently-developed and modernized C shell, created by
Nicole Hamilton, also survives on Windows in the form of
Hamilton C shell.
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