Linux, renowned for its robustness and security, is a powerful multi-user operating system that allows multiple people to interact with the same system resources without interfering with each other.

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Use "sudo usermod -a -G example_group example_user" to add a user to a group. To add a user to multiple groups at once, separate groups by commas, like "sudo usermod -a -G group1,group2,group3 example ...