Introduction to Shell Scripting | Shell Programming Tutorial | Shell Scripting Training | Uplatz

This video on Introduction to Shell Scripting by Uplatz will let you master the Shell Scripting. We provide the best online training classes to help you learn Shell Scripting, basics to advanced concepts.

A shell is an interpreter in UNIX like Operating system. It takes commands typed by the user and calls the operating system to run those commands. In simple terms, a shell acts as form of wrapper around the OS. For example, you may use the shell to enter a command to list the files in a directory, such as ls, or a command to copy, such as cp.
What are different types of Shells :

since there is no monopoly of shells , you are free to run any shell as you wish. That’s all well and good , but choosing a shell without knowing the alternative is not very helpful. Below are lists of shells available in UNIX/Linux.

1. The Bourne Shell
The Original Unix Shell is known as sh, short for shell or the Bourne shell, named for steven Bourne, the creator of sh. This is available on almost all the UNIX like operating system. The Basic bourne shell supports only the most limited command-line editing, You can type the Characters, remove characters one at a time with the Backspace key and Press enter to execute the command. If command line gets messed up, you can press Ctrl-C to cancel the whole command.

2. The C Shell
It is designed by Bill Joy at the University of California at Berkeley , the C shell was so named because much of its syntax parallels that of C programming language. This shell adds some neat features to the Bourne shell, especially the ability to recall previous commands to help create future commands. Because it is very likely you will need to execute more than one command to perform a particular task,this C shell capability is very useful.

3. The Korn Shell
It is created by David Korn at AT&T Bell laboratories , the korn shell or ksh offers the same kind of enhancements offers by the C Shell , with one important difference: The korn shell is backward compatible with the older Bourne shell Synatx. In UNIX like AIX & HP-UX korn shell is the default shell.

4. Bash ( The Bourne Again Shell)
Bash offers command-line editing like the Korn shell, filename completion like the C shell and a lot of other advanced features. Many Users view bash as having the best of the Korn and C shells in one shell. In Linux and Mac OS X system , bash is the default shell.

5. tcsh ( The T C Shell)
Linux systems popularized the T C shell to Tcsh. Tcsh extends the traditional csh to add command-line editing, filename completion and more. For example , tcsh will complete the file and directory names when you press the Tab key(the same key used in bash). The older C shell did not support this feature.

What is the Shell Script :
A Shell Script is a text file that contains one or more commands. In a shell script, the shell assumes each line of text file holds a separate command. These Commands appear for most parts as if you have typed them in at a shell window.

Why To Use Shell Script :
Shell scripts are used to automate administrative tasks,encapsulate complex configuration details and get at the full power of the operating system. The ability to combine commands allows you to create new commands , thereby adding value to your operating system. Furthermore, combining a shell with a graphical desktop environment allows you to get the best of both worlds.

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