How to Create a Shell Script on Linux – Guide
Do you want to use your Linux system to write a Shell script? tutorial will show you how to develop a shell script with multiple text editors, add comments and use Shell variables. But first, let’s see what shell programming in Linux is.
What is Shell Scripting on Linux?
So what is the Shell script? Shell Scripting is defined as an open source program executed by the Linux or Unix shell. Through shell scripts, you can write commands to be executed by the shell. Long, repetitive commands are often combined into a single command script. You can store this script and run it whenever necessary. The Shell script in Linux makes programming easy.
Ways to create a simple shell script on Linux
Creating a simple shell script on Linux is very easy. You can do this using various text editors. This tutorial will show how to create a shell script with two different methods, such as 1) using the default text editor and 2) using the Vim text editor tool.
Method 1: Using Standard Text Editor
To create a shell script using the standard text editor, just follow the steps provided below. Step 1: Create a text file with “.sh” extension. Then enter a simple script. Step 2: Now don’t change the directory. And open the terminal. Using the command below, give executable access to the created file. chmod + x testing.sh Step 3: Run the script provided below on the terminal: ./testing.sh This was a simple technique to create a shell script on Linux using the default editor. Now let’s look at the next method.
Method 2: Using the Vim Text Editor Tool
The Vim Text Editing Tool is a tool that helps to create a shell script on a Linux system. If you haven’t already installed it, use the command to install Vim: sudo apt install vim Now follow the steps to create a shell script using the tool. Step 1: To open the editor, just type: I came Step 2: After signing in, open the terminal. Then create a bash file via: vi testing.sh After executing the command, the editor will appear as below. Step 3: Press “i” on keyboard and enter Insert mode. Now type the following commands into it. #! / bin / bash echo “Welcome to the Linux family.” Step 4: Press “Esc” to exit this mode. Then type “:w” to save your script. Once saved, the shell script will appear as below. Step 5: When you are back at the console, type “:q”. So write: bash testing.sh The above command will execute the shell file and display the output in the terminal.
Using Shell Variables
Variables are values that can store information in the form of numbers and characters. Likewise, Shell variables can also store data. For example, var = “hello” echo $var The lines above will create a shell variable “var” and print it. Let’s write a little script now. #! / bin / bash variable = “This is the test shell script.” echo $ variable To get the value of the variable, run the command below. bash script_example.sh Let’s write another script using a variable. #! /bin/sh echo “what’s your name?” read name echo “How are you, $name?” read remark echo “I’m $watching too!” Run the script file and type the “name” as “Robin”. bash scriptsample.sh what’s your name? robin As you enter the input, the script reads the name and responds: How are you, Robin? Then enter the “observation” as “good”. And you’ll notice that the script repeats the observation. good i’m good too! The second line of the code set above shows the script’s response. These were some simple shell scripts. You can write advanced scripts containing loops, functions, and conditional statements. The shell script will make Linux administration a breeze.
Final note
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