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How to login as root in linux shell?

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8

The correct way to login as root is to type:

su -

This works on systems where sudo is inavailable or not configured.

Some distributions disallow logging in as root and then one should run his commands like this:

sudo MyCommandHere...
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    If you need to run a lot of commands as root but are forced to use sudo, sudo -s will get you a root shell too. – Brian Kintz Jul 20 '10 at 11:28
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I'd comment on sagar's answer if I could, as I wish to add that while

sudo -i

will log you in as root in the shell, it will move you to its home directory (/root) as well.

Edit: As said by Andreas,

sudo -s

would instead allow you to remain in your current directory, which may be useful.

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    you could also use sudo -s – Andreas Jul 20 '10 at 10:50
  • How to use this together with the-S flag in this fashion: echo "mypassword" | sudo -Si? Its not working and telling me -bash: line 1: mypassword: command not found. – kiltek Jul 3 '19 at 9:02
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use sudo -i command and put your current user password

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Reboot the computer. In the LILO boot loader, we should press Ctrl + X and type “linux single”. The sh-3.00# prompt should be displayed when Linux starts.

Type “passwd” and type the new password we want to use. Linux will ask us again to type the same password as confirmation.

Reboot the computer and start Linux normally. We should be able to login as root at the login screen. See How to Log In and Work as Root in Linux

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