The Unix Shell

The Unix shell has been around longer than most of its users have been alive. It has survived because it’s a powerful tool that allows users to perform complex and powerful tasks, often with just a few keystrokes or lines of code. It helps users automate repetitive tasks and easily combine smaller tasks into larger, more powerful workflows.

Use of the shell is fundamental to a wide range of advanced computing tasks, including high-performance computing. These lessons will introduce you to this powerful tool.


This lesson guides you through the basics of file systems and the shell. If you have stored files on a computer at all and recognize the word “file” and either “directory” or “folder” (two common words for the same thing), you’re ready for this lesson.

If you’re already comfortable manipulating files and directories, searching for files with grep and find, and writing simple loops and scripts, you probably want to explore the next lesson: shell-extras.


Setup Download files required for the lesson
00:00 1. Introducing the Shell What is a command shell and why would I use one?
00:05 2. Navigating Files and Directories How can I move around on my computer?
How can I see what files and directories I have?
How can I specify the location of a file or directory on my computer?
00:45 3. Working With Files and Directories How can I create, copy, and delete files and directories?
How can I edit files?
01:35 4. Pipes and Filters How can I combine existing commands to do new things?
02:10 5. Loops How can I perform the same actions on many different files?
03:00 6. Shell Scripts How can I save and re-use commands?
03:45 7. Finding Things How can I find files?
How can I find things in files?
04:30 Finish

The actual schedule may vary slightly depending on the topics and exercises chosen by the instructor.