Working with the SU Command in Linux

What is SU Command in Linux?

SU, or "substitute user" is a command in Linux that allows a user to temporarily assume the identity of another user account. It is primarily used to switch between user accounts or elevate privileges for certain tasks. With the SU command, a user can change their identity either by entering their own username and password, or by entering another user's username and password.

How Does SU Command Work?

The SU command works by invoking the user's shell in a new process. This new process is then responsible for interpreting and executing the command-line arguments passed to it. It is important to note that the new process always runs with the same UID (user ID) as the user who invoked it. This means that any operations performed by the new process will be done with the same privileges as the original user.

What Are the Different Options of SU Command?

When the SU command is used, there are a few different options that can be used to further customize the process. These options include: -u (specify a different user), -s (specify a different shell), and -p (preserve environment variables). By utilizing these options, users can customize the SU process to meet their needs.

Conclusion

The SU command is an important tool in Linux that can be used to switch between users or increase privileges for certain tasks. By using the various options available, users can customize the SU process to fit their needs. It is important to use the command responsibly and always check the privilege levels before granting access.