Both su and sudo allow you to run as another user, usually root, but not neccessarily. See sudo allows users to run programs with the security privileges of another user (normally the superuser, aka. root).
I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re^3: How run a daemon as non-root user by zentara
in thread How run a daemon as non-root user by halfbaked

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