Shell Script

Shell Script

All about Shell Script

Let's discuss, the Shell script today, I hope by reading this blog, your doubt about the shell script will be gone. So,

What is Shell Script?

A shell script is a list of commands in a computer program that is run by the Unix shell which is a command line interpreter. A shell script usually has comments that describe the steps. The different operations performed by shell scripts are program execution, file manipulation and text printing. A wrapper is also a kind of shell script that creates the program environment, runs the program etc.

There are two major types of shells in Unix. These are:

Bourne Shell

This is the default shell for version 7 Unix. The character $ is the default prompt for the bourne shell. The different subcategories in this shell are Korn shell, Bourne Again shell, POSIX shell etc.

C Shell

This is a Unix shell and a command processor that is run in a text window. The character % is the default prompt for the C shell. File commands can also be read easily by the C shell, which is known as a script.

What is shell scripting used for?

Using a shell script is most useful for repetitive tasks that may be time consuming to execute by typing one line at a time. A few examples of applications shell scripts can be used for include: Automating the code compiling process. Running a program or creating a program environment. Completing batch.

Is shell scripting a programming language?

Shell scripting is not a single language but, because it uses some natural language commands, it's easy to learn, even without a programming background. However, each shell scripting dialect is considered a language, and if you plan more complex activities, shells take a lot of practice.

How to write code in shell script?

How to Write Shell Script in Linux/Unix?

  1. Create a file using a vi editor(or any other editor). Name script file with extension .sh.

  2. Start the script with #! /bin/sh.

  3. Write some code.

  4. Save the script file as filename.sh.

  5. For executing the script type bash filename.sh.

What are key words in shell script?

Shell Scripting

  • Control flow: if, else, then, shell loops, case, etc.

  • Shell commands: touch, pwd, echo, ls, cd, etc.

  • Shell keywords: break, if, else, etc.

Write you first Shell script?

It's too easy to write a shell script.Here is the example with ss.

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