Can you list other environment variables?

That's a great question! In Linux, environment variables are used to store information about the system environment.

The ~ (tilde) you just used is actually a shortcut for the $HOME environment variable. To see a list of all your environment variables, you can type this command in your terminal:

env

Here are a few common ones you'll often encounter:

1. $USER: The name of the current logged-in user.
   • Try: echo $USER (Output should be labex)
2. $HOME: The path to your home directory (same as ~).
   • Try: echo $HOME (Output should be /home/labex)
3. $PWD: Your current working directory.
   • Try: echo $PWD (Output should be /home/labex/project)
4. $SHELL: The path to the shell program you are using.
   • Try: echo $SHELL (Usually /usr/bin/zsh or /bin/bash)
5. $PATH: A list of directories the system searches through when you run a command (like ls or pwd).

Note: When you want to see the value of an environment variable, you must put a $ sign before the name.

Feel free to try echo $USER in your terminal to see it for yourself! Are you ready to move on with the file operation steps?