Summary
To rename a folder or file using your terminal, enter the following command:
mv current-name new-name
Warning
If there is already a file named new-name, the above command will overwrite it with the contents of current-name, and you will lose what was inside the original new-name file. Use the mv command with caution.
Details
Examples
If you had a file named index.html that you wanted to rename about.html, you would enter the following command in your terminal:
mv index.html about.html
If the files were in a subfolder called public, you would include the folder path in your command:
mv public/index.html public/about.html
If you had a folder named folder1 that you wanted to rename folder2, you would enter the following command in your terminal:
mv folder1 folder2
Exercises
Try the following command in your project folder:
mv css/main.css css/style.css
References
Command Line Primer on the Apple Developer Archive (see the section called Frequently Used Commands)