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I accidentally changed my root shell to use a nonexistent shell, and now the root user crashes when I attempt to log in. Since I do not have sudo installed, I can't manually change the shell in etc/passwd. Are there any options in rescue mode that might help me?

  • I would Try using a live disc to fix the root shell. This would probably be your best best. Use a Live boot Cd or Usb. – NetworkKingPin Mar 21 '16 at 6:24
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    The live disk worked perfectly. I mounted my drive and used chroot to access it. I was then successfully able to modify the value of the root shell in /etc/passwd from there. – cjsimon Mar 21 '16 at 7:52
  • Glad to have Helped. – NetworkKingPin Mar 21 '16 at 7:56
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Posting this as the answer to further help those in need.

Use a Live disc in this case any live disc will work.

Mount the Drive and use chroot like @Christoper Simon stated.

And modify any settings you made that made the Distro Unusable.

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First edit /etc/shells to include a line that matches the shell you have defined for root, such as

/bin/zsh

Just having this present seems to be enough to ignore it.

su -s '/bin/bash' -c 'vi /etc/passwd'

This should hang for a bit while it looks for zsh, then carry on and run bash and execute the command.

  • It's seems to incorrectly read the incorrect shell as a part of the command: 'Cannot execute zsh' – cjsimon Mar 21 '16 at 7:07
  • For both of these? Yes, I see it does still try to invoke the home shell when you su. Hang on. – Paul Mar 21 '16 at 7:11
  • /etc/shells is read only without root permissions – cjsimon Mar 21 '16 at 7:36
  • Course it is. Crap. – Paul Mar 21 '16 at 7:47

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