The Linux Newbie Guide - chsh Command

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The chsh (change your login shell) command in Linux is used to change a user's login shell. The login shell is the command interpreter that is executed when a user logs into a system. It defines the environment in which the user interacts with the system, including the command prompt and various shell-related settings.

The chsh command allows authorized users to change their default login shell to a different one available on the system. Here's the basic syntax of the command:
chsh [OPTIONS] [USERNAME] .

[OPTIONS]: These are various options that modify the behavior of the chsh command. Common options include -s to specify a new shell and -l to list available shells.
[USERNAME]: This is the username of the user whose login shell you want to change. If not provided, the command assumes you are changing the shell for the current user.

For example, to change the login shell for the user "john" to /bin/ksh, you would run:

$ chsh -s /bin/ksh john

Additionally, changing the login shell requires administrative privileges. Typically, only system administrators or the user themselves can change their own login shell.

For more examples of usingchsh, refer to the provided link.