Change the Shell in Mac OS X Terminal

Change a User Default Login Shell

Change the user login default shell to zsh:
    chsh -s /bin/zsh

ksh:
    chsh -s /bin/ksh

tcsh:
    chsh -s /bin/tcsh

bash (default):
    chsh -s /bin/bash

sh:
    chsh -s /bin/sh

other shells:
Simply adjust the path for chsh to set, like so:
    chsh -s /path/to/alternate/shell/like/fish