su

Alex is studying to become a RHEL Sysadmin. He REALLY wants to master the most important aspects of the su commands. His home Fedora server is Fedora_Server_01. His username is alex.jimenez. Please give him examples of the most common uses of su that he'll see in his future career. Please feel free to direct him to add more users to the system if needed.

Certainly! Here are examples of the most common uses of the su command that Alex will encounter in his future career as a RHEL Sysadmin:

1. Switch to the root user:
   • su -
   • This command allows Alex to switch to the root user by providing the root password. Once switched, he can perform administrative tasks that require root privileges.
2. Switch to another user:
   • su - username
   • This command enables Alex to switch to another user by replacing "username" with the desired user's username. Alex will need to enter the user's password to switch to that account. This is useful for troubleshooting issues or performing tasks specific to a particular user.
3. Switch to another user without loading the user's environment:
   • su - username -s /bin/bash
   • By adding the -s /bin/bash option, Alex can switch to another user without loading the user's environment. This can be helpful when he needs to run commands with a clean environment or troubleshoot issues related to environment variables.
4. Run a command as another user:
   • su - username -c "command"
   • This command allows Alex to execute a specific command as another user. He should replace "username" with the desired user's username and "command" with the command he wants to run. He will be prompted for the user's password before executing the command.
5. Create a new user:
   • su -c "useradd username" -
   • Using the -c option followed by the command in double quotes, Alex can run administrative commands as the root user. In this example, he can create a new user by replacing "username" with the desired username.
6. Modify a user's password:
   • su -c "passwd username" -

With this command, Alex can change a user's password by replacing "username" with the desired username. He will be prompted to enter and confirm the new password.

Remember to replace "username" with the actual username you want to use in each command. These examples cover some of the most common uses of the su command, which will help Alex manage user accounts, switch between users, and perform administrative tasks on his Fedora server, Fedora_Server_01.