How can you open and view the contents of a file in the Linux command line?

In Linux, there are several commands to view the contents of a file in the command line:

• cat filename — displays the entire file.
• less filename — allows you to view the file page by page with scrolling.
• more filename — similar to less, but with more limited capabilities.
• head filename — shows the first 10 lines of the file.
• tail filename — shows the last 10 lines of the file.

For example, to view the file example.txt page by page, you can run:

less example.txt