Ext2: Shell Scripting Part OneFeb 27, 2000, 15:41 (2 Talkback[s])
(Other stories by Robert Jones)
[ Thanks to Devin M. Ash for this link. ]
"But, before the discussion of various shells, a word about why this is relevant. As has been stated, a shell's basic job is to take commands and either act on them itself, or run other programs to do it. Often, this is done interactively, with a user issuing commands one at a time, and the shell processing them as they come in."
"However, almost universally, shells will also accept groups, or "batches", of commands at once. These can be entered manually, in a single go, on the command line, or you can simply direct your shell to a file, which it will read, and treat the contents of as commands issued to it. In the DOS world, files such as this were known as "batch files"; to Unix users, they are "shell scripts". Shell scripts can be, and often are, much more complex than batch files."
"As I said earlier, there are multiple shells commonly available for Unix systems. The one that new Linux users most commonly encounter is bash, the "Bourne again shell" -- so named because it was based on the old Bourne shell, simply called sh. Other shells that new users will frequently encounter are csh (and its improved brother, tcsh), ksh (and its free version, pdksh), and zsh."