I've been using Cygwin for quite a while now. I now want to switch to fish from bash. Everyone is saying that you should use chsh -s /usr/bin/fish, but for some reason, chsh does not work for me. Trying to modify my Cygwin.bat file doesn't work either, and neither does changing my /etc/passwd file.
I really don't understand what's going on. Could someone please help me?
Answer
Try editing /etc/nsswitch.conf instead of /etc/passwd
Instead of creating a passwd file, which Cygwin recommends against1, you could edit /etc/nsswitch.conf. Add or edit the following line:
db_shell: /usr/bin/fish
The down/up side of this method is that, if you have multiple users, this change affects all of them. The up/up side is that it's dead simple. The only catch is that you have to restart Cygwin.
If you do use mkpasswd after this change, it will use your new default shell for all users that are allowed to log on.
References
1 The mkpasswd documentation says this:
Don't use this command to generate a local /etc/passwd file, unless you really need one. See the Cygwin User's Guide for more information.
I can't really find any solid reasoning in the user's guide, other than a mention that you'll have to regenerate the /etc/passwd and /etc/group files if your users and groups change, which I suppose is a decent enough reason. I can say that the process is somewhat error prone for newbies.