The Unix command su, which stands for "substitute user" [1][2] (or historically "superuser" [3][4]), is used by a computer user to execute commands with the privileges of another user account.

Dec 10, 2025 · The su Linux command switches users and elevates privileges in a session. This guide shows how it works and when to use it.

su is mostly designed for unprivileged users, the recommended solution for privileged users (e.g., scripts executed by root) is to use non-set-user-ID command runuser(1) that does not require authentication …

Run a command with substitute user and group id, allow one user to temporarily become another user. It runs a command (often an interactive shell) with the real and effective user id, group id, and …

Nov 14, 2025 · The su command stands for "switch user." It allows a user to change their current user identity to another user. By default, if no username is specified, su will switch to the root user. When …

Jul 23, 2025 · As a new Linux user, you may always face confusion regarding the difference between `su` command and `su -` command. In Linux, the `su` command is used to switch to another user …

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Jun 1, 2025 · This page covers the GNU / Linux version of su. The su command, which is short for substitute user or switch user, enables the current user to act as another user during the current …

4 days ago · Russia is pitching India the Su-57E with deep tech transfer and source code, plus “Make in India” assembly—an offer meant to look different this time.

Dec 17, 2024 · The su command, short for “substitute user,” is a utility in Unix and Linux-based operating systems that allows a user to switch to another user’s shell.