chsh

Set login shell interactively

$ chsh

$ chsh -l

$ chsh -s [path/to/shell]

$ sudo chsh -s [path/to/shell] [username]

chsh [options] [username]

chsh changes a user's login shell, which is the program started when the user logs in. The new shell must be listed in /etc/shells unless the change is made by root.
Regular users can change their own shell; root can change any user's shell. The change takes effect on the next login. The user is authenticated before the change is made, so a password is required unless run as root.
Common use cases include switching between bash, zsh, fish, or other shells. Part of the util-linux package on Linux systems.

-s, --shell shell

Specify the new login shell

List shells from /etc/shells

Display help message

/etc/shells

List of valid login shells. Only shells listed here can be set by non-root users.

The shell must exist and be listed in /etc/shells. An invalid shell can lock users out of their accounts. Changes take effect on next login. Part of the util-linux package.

usermod(8), passwd(1), login(1)