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I want to change my default shell from tcsh to bash. So I tried and this is what happened:

>sudo chsh userid
Changing the login shell for userid
Enter the new value, or press ENTER for the default
        Login Shell [/xhbin/tcsh]: /bin/bash
chsh: user 'userid' does not exist in /etc/passwd

Indeed, I am not in /etc/passwd. I don't know why.

What can I do?

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Is your system using distributed authentication (e.g. kerberos / winbind)? In that case your user details would not appear in the local /etc/passwd file (but should be visible using getent passwd <userid>). I think that whether running chsh is supported in that case may depend on settings in /etc/pam.d/ –  steeldriver Sep 21 '13 at 13:28
    
Yes that was the problem, thanks. –  rmp251 Jan 14 at 17:31
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3 Answers

If you want to change the shell for your user, you do not need to become root. Just type:

chsh

without sudo and without arguments.


See also man chsh:

The chsh command changes the user login shell. This determines the name
of the user's initial login command. A normal user may only change the
login shell for her own account; the superuser may change the login
shell for any account.
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The reason I used sudo was because it didn't do anything without it. > whoami userid > chsh You may not change the shell for 'userid'. –  rmp251 Jan 10 at 19:31
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up vote 2 down vote accepted

My computer is part of a network using using distributed authentication so my user details would not appear in the local /etc/passwd file (but are visible using getent passwd userid). (thanks @steeldriver) In my case I had to do chsh on a core machine.

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can you explain what a "core machine" is? –  Nerrve Jan 23 at 8:49
    
In my case I'm referring to a set of dedicated machines provided by the university inside their network that students can log into and use (shared). As opposed to my own machine in my office. –  rmp251 Jan 23 at 17:12
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If you forgot your user name, you can use whoami command to remember you.

So, try with:

sudo chsh $(whoami)

If indeed, doesn't exist a line starting with your user name in /etc/passwd file (which seems inexplicable), you can add a new one like this:

username:x:1000:1000:your real name,,,:/home/username:/bin/bash

See also: Understanding /etc/passwd File Format.

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