How can I use environment variables in my Linux scripts?

How can I use environment variables in my Linux scripts?

You can use environment variables in your scripts by referencing them with a dollar sign. For example, use $HOME to access the home directory.

Can I set an environment variable within a script?

Yes, you can set an environment variable in a script using the syntax VAR_NAME=value. For example, MY_VAR=hello.

How do I access a variable that I set in a script later?

You can access it in the same script or in any child processes by using the syntax $MY_VAR. However, it won't be available in the parent shell.

What if I want to make the variable available to the parent shell?

You can use the 'export' command before setting the variable, like this: export MY_VAR=hello. This makes it available to child processes.