How can I use environment variables in my shell scripts?

How can I use environment variables in my shell scripts?

You can use environment variables in shell scripts by referencing them with a dollar sign, like $VARIABLE_NAME.

Can you give me an example of how to set and use an environment variable?

Sure! You can set a variable like this: MY_VAR='Hello World'. Then use it in your script with echo $MY_VAR.

What if I want to export the variable so it's available in child processes?

You can export a variable by using the export command: export MY_VAR='Hello World'. This makes it available to any child processes.

Are there any best practices for using environment variables in scripts?

Yes, it's best to use uppercase names for environment variables, keep them consistent, and avoid using spaces.