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What is the difference between sudo and root?
| Question | sudo |
Root |
|---|---|---|
| What is it? | A command that requests policy-authorized execution as a target user. | The privileged Unix/Linux account, conventionally identified by user ID 0. |
| What runs with elevated privileges? | The command you specify runs under the selected target identity and execution settings. | A root shell or login runs commands under the root identity for the duration of that session. |
| Who can use it? | Users permitted by the system’s sudo security policy; allowed commands and target identities depend on configuration. | Root access depends on how the system’s account and login access are configured. |
| What is the main caution? | An allowed program might itself enable broader access, such as by launching a shell. | Commands run in a root shell have privileged context until that shell ends. |
The sudo(8) manual defines sudo as allowing a permitted user to execute a command “as the superuser or another user, as specified by the security policy.” The passwd(5) manual identifies UID 0 with the root account.
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What does sudo do when you run a command?
When you enter a command with sudo, sudo checks the applicable security policy. If that policy permits the request, sudo runs the command as the selected target user. The target is usually root by default, but sudo can also request another user, for example with sudo -u username command. Whether a particular user may run that command as that target is still determined by local policy.
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So sudo is not another name for root, and it does not permanently change the invoking account’s identity. It runs a permitted command in the target identity’s execution context.
Does sudo make you root?
sudo command does not make your account root. It runs the specified command as the policy-selected target user—commonly root—if your request is allowed. A command’s behavior depends on that target identity and the execution settings applied by the policy.
A command can request another target identity rather than root. For instance, sudo -u username command asks to run it as username; this is only available when the local policy allows it.
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How is a sudo command different from a root shell?
One command through sudo
For a single administrative task, an invocation such as sudo command ties the request to that command. Authorization is checked for that request under the configured policy. This does not guarantee the program is harmless or tightly limited: the program may have its own route to perform other actions.
A shell running as root
Commands such as sudo su or sudo sh can start a shell under a privileged identity. Commands entered inside that shell run in its root context until you exit. They are not each separately checked by sudo’s ordinary command policy. The sudo manual also documents sudo -i; the exact behavior and availability depend on the installed sudo version and local configuration.
A root shell can suit work that genuinely requires several commands in a sustained privileged context. It also means an accidental command is executed with that context, so exit the shell when the work is done.
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Is sudo safer than using root?
Sudo can provide policy-based access control, auditing, and optional input/output logging, but what is enabled depends on system configuration. It is not automatically a sandbox, and the existence of a sudo rule does not by itself make the permitted program safe to delegate.
- Check what the allowed command can do. A permitted program may offer a shell escape or another way to run commands.
- Do not allow commands the user can change. The sudo manual warns against granting access to files the user can modify, or files in directories the user can modify, because the permitted command could be replaced.
- Be careful with editors and similar programs. Some can launch a shell, potentially turning a narrow-looking permission into broader privileged access.
- Review local rules rather than assuming defaults. Sudoers policy, authentication, logging, and root-login configuration vary across systems.
When editing sudoers configuration, use visudo, which the sudo(8) manual recommends to catch syntax errors before they are introduced.
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