-h

Display help message and exit.

-R

Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

-s

The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter thenew value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ]marks.NOTEThe only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is thesuperuser, and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason,placing /bin/rsh in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from everchanging her login shell back to its original value.FILES/etc/passwdUser account information./etc/shellsList of valid login shells./etc/login.defsShadow password suite configuration.