Linux Commands Helper

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su Command - Switch User

su (substitute user) allows you to switch to another user account in the current session. By default, it switches to the root user if no username is specified.

Syntax

su [options] [username]

Examples

su

Switch to the root user.

su username

Switch to the specified user account.

Notes

  • Requires the target user's password.
  • Use su - to start a login shell as the target user.
  • For administrative tasks, sudo is often preferred over su.

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