In the various versions of DOS that were in use
back then, the only way you could communicate with the operating system was to
enter commands through a command-line shell called COMMAND.COM.
Linux also uses command-line shells. However, unlike DOS, you have a choice of
which shell you want to use. As with many other aspects of Linux, you can try out
several of different command-line shells and choose the one that you like the best.
Some of the more popular shells include the following:
?– sh (Bourne Shell) The sh shell was the earliest shell, being developed for
UNIX back in the late 1970s. While not widely used on Linux systems, it is
still very widely used on UNIX systems.
?– bash (Bourne-Again Shell) The bash shell is an improved version of the
sh shell and is one of the most popular shells today. It??™s the default shell used
by most Linux distributions. If you??™re using the command line on a Linux
system, more than likely you??™re using the bash shell.
?– csh (C Shell) The csh shell was originally developed for BSD UNIX. It uses
a syntax that is very similar to C programming.
?– tsch The tsch shell is an improved version of the C Shell. It is the default
shell used on FreeBSD systems.
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