Introduction to several common Shells
Linux provides a variety of shell options. Frequently used include Bourne shell (SH), C-shelll (CSH), KoRn shell (Ksh), And Bourne again shell (BASH ).
(1) The Bourne shell is developed by Steven Bourne Of The at&t Bell lab for at&t Unix. It is the default shell of UNIX and is also the basis for development of other shells. Bourne shell is excellent in programming, but it is inferior to several other shells in dealing with user interactions.
(2) c shell is developed for bsd unix by Bill Joy of Berkeley University in California. Unlike SH, C shell syntax is similar to C language. It provides user interaction features that the Bourne shell cannot process, such as command completion, command alias, and historical command replacement. However, C shell and bourneshell are not compatible.
(3) The Korn shell is developed by David Korn of the at&t Bell lab. It integrates the advantages of C shell and Bourne shell and is fully compatible with the Bourne shell. The Korn shell is highly efficient, and its command interaction interface and programming interaction interface are both very good.
(4) Bourne again shell (BASH) is a shell developed by the Free Software Foundation (GNU). It is a default shell in Linux. Bash is not only compatible with the Bourne shell, but also inherits the advantages of C shell and Korn shell.
