The su command lets you switch the current user to any other user. If you need to run a command as a different (non-root) user, use the –l [username] option to specify the user account. Additionally, su can also be used to change to a different shell interpreter on the fly.
sudo su - The sudo command allows you to run programs as another user, by default the root user. If the user is granted with sudo assess, the su command is invoked as root. Running sudo su - and then typing the user password has the same effect the same as running su - and typing the root password.
su , on the other hand, is an acronym for switch user or substitute user. Most often, the user account you switch to is the root account but it can be any account on the system. For example, if you type: $ su - In the above example, you are switching to root and you need the root password.
su is one of the core utilities in Linux. It allows users to execute commands as another user. The most common use of the su is to get superuser privileges. This argument tells su to invoke a login shell, which resets all the environment variables and creates them again.
Both su and sudo elevate privileges assigned to the current user. The main difference between the two is that su requires the password of the target account, while sudo requires the password of the current user. Therefore, it is much safer to use sudo since it doesn't include exchanging sensitive information.
What to Know
- To switch to the root user on Ubuntu-based distributions, enter sudo su in the command terminal.
- If you set a root password when you installed the distribution, enter su.
- To switch to another user and adopt their environment, enter su - followed by the name of the user (for example, su - ted).
Android is based on Linux, so the terminal acts just like Linux or a Mac. NO, Generally you dont have a command prompt like thing in andriod , But you can use Terminal Emulator app which works like a command prompt in Andriod. This app can be downloaded from the play store.
The su command does not execute anything, it just raise your privileges. Try adb shell su -c YOUR_COMMAND . By default CM10 only allows root access from Apps not ADB. Go to Settings -> Developer options -> Root access, and change option to "Apps and ADB".
To manage root permissions, open your app drawer and tap the SuperSU icon. You'll see a list of apps that have been granted or denied superuser access. You can tap on an app to change its permissions.
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.
ADB is
Android Debug Bridge which is a command line utility included with Google's Android SDK.
Adb Shell commands.
| Adb Shell commands | Action performed by command |
|---|
| adb shell ls -R | list subdirectories recursively |
| adb shell netstat | list tcp connectivity |
| adb shell pwd | print current working directory location |
| adb shell dumpstate | dumps state |
Introduction# adb shell opens a Linux shell in a target device or emulator. It is the most powerful and versatile way to control an Android device via adb . This topic was split from ADB (Android Debug Bridge) due to reaching the limit of examples, many of which were involving adb shell command.
Go to settings > about device > build number. Tap build number multiple times like a madman until you see a toast saying you have successfully turned on development settings. Now head into development settings (usually in main settings screen) and search for an option saying enable local terminal. If you find it great!
In most versions of Android, that goes like this: Head to Settings, tap Security, scroll down to Unknown Sources and toggle the switch to the on position. Now you can install KingoRoot. Then run the app, tap One Click Root, and cross your fingers. If all goes well, your device should be rooted within about 60 seconds.
How to Open Root Terminal in Linux Mint
- Open your terminal app.
- Type the following command: sudo su.
- Enter your password when prompted.
- From now, the current instance will be the root terminal.
If you run sudo su , that will open a shell as the superuser. Type exit or Ctrl – D to exit this shell.
How to become superuser on Ubuntu Linux
- Open a terminal Window/App.
- To become root user type:
- When promoted provide your own password.
- After successful login, the $ prompt would change to # to indicate that you logged in as root user on Ubuntu.
Executive summary: "root" is the actual name of the administrator account. "sudo" is a command which allows ordinary users to perform administrative tasks.
It seems that the idea that is presented is one of safety. As long as you use sudo you cannot really harm your system. This misconception is why sudo is bad. You can cause as much damage with sudo as you can with root.
sudo allows finer grain control. One can configure sudo to give root access to some but not all commands. sudo uses the login password. This protects having to give the root password (as you would with su) and is related to the point above regarding finer grained control / access to root.
The su command is used to become another user during a login session. Invoked without a username, su defaults to becoming the superuser. The optional argument - may be used to provide an environment similar to what the user would expect had the user logged in directly.
postgresql shell sudo su. PostgreSQL users peer authentication on unix sockets by default, where the unix user must be the same as the PostgreSQL user. So people frequently use su or sudo to become the postgres superuser.
How to to run sudo command without a password:
- Gain root access: su -
- Backup your /etc/sudoers file by typing the following command:
- Edit the /etc/sudoers file by typing the visudo command:
- Append/edit the line as follows in the /etc/sudoers file for user named 'vivek' to run '/bin/kill' and 'systemctl' commands:
You need to set the password for the root first by "sudo passwd root", enter your password once and then root's new password twice. Then type in "su -" and enter the password you just set. Another way of gaining root access is "sudo su" but this time enter your password instead of the root's.
You can also su to another user without requiring a password by making some changes in the sudoers file. In this case, the user (for example aaronk) who will switch to another user account (for example postgres) should be in the sudoers file or in the sudo group to be able to invoke the sudo command.
sudo is a command to execute other commands as other users, usually root, and has nothing to do with PuTTY at all. So after you connect with PuTTY, and you're logged in to the remote system, you use the 'sudo' command. For example: sudo rm -rf /some/directory/you/not/accessible/by/you.
The sudo apt-get update command is used to download package information from all configured sources. So when you run update command, it downloads the package information from the Internet. It is useful to get info on an updated version of packages or their dependencies.
4 Answers
- Run sudo <command> and type in your login password, if prompted, to run only that instance of the command as root. Next time you run another or the same command without the sudo prefix, you will not have root access.
- Run sudo -i .
- Use the su (substitute user) command to get a root shell.
- Run sudo -s .
