vi

The `vi` command classic Unix modal text editor available on virtually every system. Text viewing and editing commands are fundamental tools in any Linux user's toolkit.

Linux treats almost everything as a file, so the ability to quickly inspect, filter, transform, and edit file contents from the command line is critical. These commands are regularly combined with pipes and redirects to build powerful data-processing pipelines.

The command accepts 4 commonly used flags shown above, though the full set of options is available in the man page (`man vi`). The 4 examples on this page cover typical real-world usage patterns that you can copy and adapt for your own workflows.