Odd.  To change to csh with sshd I have /bin/tcsh in /etc/passwd.
I then wanted to automatically switch to CMD so I tried /cygdrive/c/.../cmd.exe 
but I was getting extra newlines from cmd.
I ended up switching to tcsh in /etc/passwd and using a .login containing

exec cmd /q

to stop the newlines.  

Perhaps you can try a .profile with an exec to fish?


---------------------------------
Hm. So this is documented in "The db_shell setting" at 
https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-mapping-nsswitch. AFAICT, the 
only useful option there for my purposes is to set

db_shell = /bin/fish

After restarting sshd, this does make fish my login shell. Of course, it makes 
fish the login shell for every other user on the host too, but for single-user 
hosts such as mine, that works fine. Thanks.

Andrew


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