要在Linux終端切換用戶，主要有三種方法。 1. 使用su命令切換用戶，如su或su jane，需輸入目標用戶密碼。 2. 使用sudo su切換到root或其他用戶，需當前用戶有sudo權限。 3. 通過ssh jane@host遠程登錄指定用戶，需目標用戶憑證或密鑰。根據使用場景選擇合適方法即可。

Switching users in the Linux terminal is a common task, especially when managing servers or working in multi-user environments. It's straightforward once you know the commands, and it can be done quickly without needing to log out.

Using the su Command

The most basic way to switch users in Linux is with the su command, which stands for "substitute user." By default, if you just type:

 su

...and press Enter, it will try to switch you to the root user. You'll need to enter the password for that user (unless you're already root).

If you want to switch to a different user, say jane , you'd use:

 su jane

You'll then be prompted for jane 's password. Once authenticated, your shell session becomes that of the target user.

A few things to note:

• The original environment is not fully preserved unless you use su - , which simulates a full login.
• Some systems may require users to be in the wheel group to switch to root using su .

Switching with sudo su

Another common method, especially if you have sudo privileges, is using:

 sudo su

This temporarily elevates your current session to root. No password is needed if your account has sudo access — though some systems are configured to ask for your own password before allowing this.

To switch to another user with sudo, you can do:

 sudo su jane

Again, depending on system configuration, you might not need jane 's password here.

Keep in mind:

• sudo su gives you a root shell, which can be risky if used carelessly.
• It's often preferred to run individual commands with sudo rather than switching entirely.

Logging In as Another User Remotely (SSH)

If you're accessing a machine remotely and want to log in directly as another user, you can do so with SSH by specifying the username:

 ssh jane@yourserver.com

This logs you in as jane from the start. If you don't have jane 's credentials, this won't work — unlike su , SSH doesn't let you bypass the password unless public key authentication is set up.

In short, pick the method based on what you're trying to accomplish:

• Use su if you're already logged in and want to switch locally.
• Use sudo su if you need elevated privileges and have permission.
• Use ssh user@host when connecting remotely.

基本上就這些。

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