Fish shell as default

Question

I'm trying to become the root on my terminal with sudo -i command, but the system display sudo: /usr/local/bin/fish: command not found. I tried to set the fish shell as default, but I got a problem. Could anyone be able to tell me what I could do to fix the problem?

I tried to set fish shell as default with first sudo echo /usr/local/bin/fish >> /etc/shells and after chsh -s /usr/local/bin/fish. However, it looks like I have more than one usr/local/bin/fish file in /usr/shells. (In fact, I followed from there)

Thanks in advance!

P.S. I know now the file is not usr/local/bin/fish, but usr/local/bin. I've succeeded to set fish shell as default, but I'm still having the sudo -i problem.

You're gonna have to give us a little history. How did you set it as default? How did you install it? — TheWanderer, Nov 11 '16 at 01:01
Yes, I am with Ubuntu. However, It seems that procedure also work in Ubuntu (see http://stackoverflow.com/questions/453236/how-to-set-my-default-shell-on-mac). — Sandra Ross, Nov 11 '16 at 01:13
I think you're getting that error because Ubuntu doesn't have fish installed by default. You need to use sudo apt install fish. — TheWanderer, Nov 11 '16 at 01:16
Yes, I did that. It is indicated chsh: /usr/local/bin/fish is an invalid shell — Sandra Ross, Nov 11 '16 at 01:17
I doubt apt would have installed it to /usr/local - more likely /usr/bin/fish. Also sudo echo ... to write to /etc/shells isn't going to work - see When using sudo with redirection, I get 'permission denied' — steeldriver, Nov 11 '16 at 01:20
Ok, now I've succeeded to set up fish shell as default, but I'm still having the problem of ̀sudo: /usr/local/bin/fish: command not found. — Sandra Ross, Nov 11 '16 at 01:29
What's the output of which fish, grep fish /etc/shells, and getent passwd root | cut -d: -f7? — David Foerster, Nov 11 '16 at 08:23
@SandraRoss, I encountered that error message, and I think my answer below solves that problem. — Chai T. Rex, Nov 11 '16 at 19:55

Chai T. Rex · Accepted Answer · 2016-11-11T02:15:51.083

To replace a bad default shell for root with fish:

Install fish (with sudo apt install fish if you want Ubuntu's package)
Run sudo nano /etc/pam.d/chsh
Insert a # in front of the line auth required pam_shells.so
Save and exit by pressing Ctrl+O, Enter, Ctrl+X
Run sudo chsh -s $(which fish) (remove the $ if you're doing all this within fish)
Run sudo nano /etc/pam.d/chsh
Remove the # you inserted
Save and exit by pressing Ctrl+O, Enter, Ctrl+X

Now, you can test that the shell is set properly with sudo -i.

Fish shell as default

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