How do you create a new environment variable in Linux?

To create a new environment variable in Linux, you can use the export command in the terminal. Here’s how to do it:

Open a terminal.
Use the export command:
```
export VARIABLE_NAME="value"
```
Replace VARIABLE_NAME with your desired variable name and value with the value you want to assign.

Example:

export MY_VARIABLE="Hello, World!"

Verify the variable:
You can check if the variable is set by using:
```
echo $MY_VARIABLE
```

Making it Permanent:

To make the variable permanent (available in future sessions), add the export command to your shell's configuration file (e.g., .bashrc or .zshrc):

Open the configuration file in a text editor:
```
nano ~/.bashrc  # or ~/.zshrc for zsh users
```
Add the export command at the end of the file:
```
export MY_VARIABLE="Hello, World!"
```
Save the file and exit the editor.
Apply the changes:
```
source ~/.bashrc  # or source ~/.zshrc
```

Now, MY_VARIABLE will be available in all future terminal sessions. If you need further assistance, feel free to ask!