unprivileged user
also: regular user, non-root user, standard user
A user account on Linux that does not have superuser (root) privileges and cannot perform system-wide administrative tasks. Unprivileged users operate with restricted permissions for security and system stability.
An unprivileged user is any regular user account created on a Linux system that lacks root or sudo access. These users cannot directly modify system files, install software system-wide, manage other users, or change network configurations. They can only modify files and directories they own or have explicit permission to access.
Most daily Linux use happens under unprivileged accounts for security reasons—if a compromised application is running as an unprivileged user, the damage is limited to that user's files rather than the entire system. For example, a user alice can edit her own documents in /home/alice/ but cannot edit /etc/passwd or install packages with apt install.
When unprivileged users need to perform privileged tasks, they typically use sudo (if configured by the administrator) to temporarily run specific commands with elevated permissions. This is safer than logging in as root directly.