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.

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.

Oct 8, 2024 · In this how-to guide, we will explore how to effectively use the su command in Linux with practical examples.

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, …

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 …

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 …

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Nov 14, 2025 · The su command allows a user to switch to another user account on a Linux system. When you run su, you can either switch to the root user (the superuser with full …

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The su (substitute user) command in Linux is used to switch to another user account within a terminal session. By default, it switches to the root user, allowing administrators to perform …