How to Write a Shell Script Using Bash Shell in Ubuntu: 10 steps

How to Write a Shell Script Using Bash Shell in Ubuntu: 10 steps [article taken from the Anil Mahadev & 4 others]

How to Write a Shell Script Using Bash Shell in Ubuntu

Edited byAnil Mahadev and 4 others

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Ever wanted to Automate operations in your OS? Ever wanted to write a program that could create a file, copy that file to a directory? And using the Famous BASH Shell in Ubuntu? If the answers to both these questions areYes!, then this is the How-To for you!

We shall cover a simple example. How to create a Shell Script that displays the list of files present in a directory

EditSteps

1. 1
   

    Terminal
   Launch the Terminal by clicking on Applications --> Accessories --> Terminal
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2. 2
   Next in the Terminal launch the vi/vim editor. My fav is vim.
3. 3
   In the terminal window, type vim ListDir.sh and hit enter. Once inside the Editor, type "I" or "i". This will allow you to insert / start typing your shell script.
4. 4
   At the top type the following code #!/bin/bash. This is known as a Shebang line
5. 5
   

    master script 1
   Now type the code as shown in the figure
6. 6
   Now to come out of the vim editor, type the following key combinations, Esc, : , wq! This will write the changes to the file and bring you back to the terminal.
7. 7
   

    executable
   Now we need to make this Shell Script, executable. To do this, enter the following command
8. 8
   chmod +x ListDir.sh and hit enter. You can see the results below
9. 9
   

    script output
   To run this Shell Script, simply type ./ListDir.sh . You should get the list of directories and the message as shown below
10. 10
    Congratulations on writing your 1st Shell Script using Bash in Ubuntu Linux!