SU means "Shut Up" So now you know - SU means "Shut Up" - don't thank us. YW! What does SU mean? SU is an acronym, abbreviation or slang word that is explained above where the SU definition is given.
The Linux command 'su' is used to switch from one account to another. User will be prompted for the password of the user switching to. Users can also use it to switch to root account. If user types only 'su' without any option then It will be considered as root and user will be prompted to enter root user password.
su - logs you in completely as root, whereas su makes it so you are pretending to be root. The most obvious example of this is that ~ is root's home directory if you use su - , but your own home directory if you use su . Depending on your system, it may also mean differences in prompt, PATH , or history file.
By default, the superuser ( root ) account is disabled and doesn't have any password. You can create one by running: $ sudo passwd root. You will then be able to login as root by running su using this password. As for chmod , the correct command would be: $ chmod 777 -R foobs.
The su command is used to switch to another user, in other words change user ID during a normal login session (that is why it is sometimes referred to as switch (-) user by a number of Linux users). If executed without a username, for example su - , it will login as root user by default.
To get root access, you can use one of a variety of methods:
- Run sudo <command> and type in your login password, if prompted, to run only that instance of the command as root.
- Run sudo -i .
- Use the su (substitute user) command to get a root shell.
- Run sudo -s .
How to become superuser on Ubuntu Linux
- Open a terminal Window. Press Ctrl + Alt + T to open the terminal on Ubuntu.
- To become root user type: sudo -i. sudo -s.
- When promoted provide your password.
- After successful login, the $ prompt would change to # to indicate that you logged in as root user on Ubuntu.
One is to type the word exit and then press the ENTER key. Another is to simultaneously press the CTRL and d keys. If su was originally used together with the hyphen (i.e., su -), then there is an additional way to return the session to the previous user: it is by typing the word logout and then pressing the ENTER key.
Or you can simply press CTRL + D . Just type exit and you will leave the root shell and get a shell of your previous user.
sudo su means run the command su as sudo which means as root. So su command won't ask for a password. It's same as if you are a root then su to any other user will not ask for password because you are a root. When you just run the command su , you are running it as a regular user.
Get a List of All Users using the /etc/passwd File
- User name.
- Encrypted password ( x means that the password is stored in the /etc/shadow file)
- User ID number (UID)
- User's group ID number (GID)
- Full name of the user (GECOS)
- User home directory.
- Login shell (defaults to /bin/bash )
Switch or delete users
- From the top of any Home screen, the lock screen, and many app screens, swipe down with 2 fingers. This opens your Quick Settings.
- Tap Switch user .
- Tap a different user. That user can now sign in.
The Unix command su, which stands for substitute user is used by a computer user to execute commands with the privileges of another user account. When executed it invokes a shell without changing the current working directory or the user environment.
To kill a process use the kill command. Use the ps command if you need to find the PID of a process. Always try to kill a process with a simple kill command. This is the cleanest way to kill a process and has the same effect as cancelling a process.
To become root in Linux by gaining access in the terminal, type “su -” and press “Enter” to log in as a “super user.” When you're prompted, enter the root password and the commands that require root access.
Runas is a command-line tool that is built into Windows Vista. To use runas at the command line, open a command prompt, type runas with the appropriate parameters, and then press ENTER. In the user interface for Windows Vista, the Run as… command has been changed to Run as administrator.
su root (which can be shortened to just su ) runs the su command as the user who invoked it. sudo runs the specified command ( su ) as root. Running su as root is essentially a no-op, though it probably starts a new shell.
Add the following to /etc/sudoers:
- from_user ALL=NOPASSWD: /bin/su - to_user. This allows from_user to login as to_user by issuing this command:
- sudo su - to_user.
- sudo -u to_user -i from_user ALL=(to_user) NOPASSWD: /bin/bash.
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