change login shell
command changes the user login shell. This determines the
name of the user's 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.
which apply to the chsh command are:
Display help message and
Apply changes in the
CHROOT_DIR directory and use the configuration files
from the CHROOT_DIR directory.
The name of the user's new
login shell. Setting this field to blank causes the system
to select the default login shell.
−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 [ ]
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.
User account information.
List of valid login shells.
Shadow password suite