To check if you have Blender properly installed from the command line in a Unix terminal, you can try running the blender command with the -v or --version option. Here's an example command:

blender -v

This will output the version of Blender that is currently installed on your system. If Blender is properly installed and in your system's PATH, you should see something like:

Blender 2.93.4

If Blender is not installed or not properly configured, you may see an error message instead.
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