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Bookmark or Share- Why am I getting "Authentication failure" when running the "su" command ...su asks for the password of the account you're trying to login. It's usage (simplified): su username When omitting username, the username default to root. Since the root password is disabled by default on Ubuntu, no password will be valid. The preferred way to run root commands is not through a su shell, but with sudo as in: sudo mount /dev ...
- What are the differences between "su", "sudo -s", "sudo -i", "sudo su"?su lets you switch user so that you're actually logged in as root. sudo -s runs a shell with root privileges. sudo -i also acquires the root user's environment. To see the difference between su and sudo -s, do cd ~ and then pwd after each of them. In the first case, you'll be in root's home directory, because you're root.
- su vs sudo -s vs sudo -i vs sudo bash - Unix & Linux Stack Exchangesu - means environment variables will be reset to root and su means environment variables as old user. for example: root's home directory if you use su - or old user home directory if you use su . sudo ( s uper u ser do ) is a command-line utility that allows users to run programs with the security privileges of another user, by default is ...
- What is the difference between 'su -' and 'su root'? [duplicate]su - switches to the superuser and sets up the environment so that it looks like they logged in directly. su root switches to the user named root and doesn't simulate directly logging in. If the superuser is named root, then su and su root are equivalent (and don't simulate directly logging in), as are su - and su - root (which do).
- su - What is the command to switch to normal user? - Ask UbuntuI am trying to use the su/sudo command to switch to a regular user. It asks me for a password and I enter the admin password then it says su: Authentication failure : walter@walter-VirtualBox:~/testdir$ su Password: su: Authentication failure walter@walter-VirtualBox:~/testdir$
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