chsh - change login shell
chsh [options] [LOGIN]
The chsh command changes the user login shell. This determines the name of the users initial login command. A normal user may only change the login shell for her own account; the superuser may change the login shell for any account.
The options which apply to the chsh command are:
-h, --help
Display help message and exit.
-R, --root CHROOT_DIR
Apply changes in the
CHROOT_DIRdirectory and use the configuration files from theCHROOT_DIRdirectory. Only absolute paths are supported.
-s, --shell SHELL
The name of the users 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 the new 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.
The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser, 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 ever changing her login shell back to its original value.
/etc/passwd
User account information.
/etc/shells
List of valid login shells.
/etc/login.defs
Shadow password suite configuration.
chfn(1), login.defs(5), passwd(5).