SU(1) General Commands Manual SU(1)NAME
su - temporarily log in as superuser or another user
SYNOPSIS
su [name]
EXAMPLES
su # Become superuser
su ast # Become ast
DESCRIPTION
Su can be used to temporarily login as another user. It prompts for the superuser password. If the correct password is entered, su cre-
ates a shell with the desired uid. If no name is specified, root is assumed. To exit the temporary shell, type CTRL-D. When memory is
tight, it is better to become superuser by logging out and then logging in again as root, rather than using su since the latter creates an
extra shell in memory. Any user with a zero group id need not type a password. This makes life easier for the system administrator.
SEE ALSO login(1).
SU(1)
Check Out this Related Man Page
CHSH(1) User Commands CHSH(1)NAME
chsh - change login shell
SYNOPSIS
chsh [options] [LOGIN]
DESCRIPTION
The chsh 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.
OPTIONS
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_DIR directory and use the configuration files from the CHROOT_DIR directory.
-s, --shell SHELL
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 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.
NOTE
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.
FILES
/etc/passwd
User account information.
/etc/shells
List of valid login shells.
/etc/login.defs
Shadow password suite configuration.
SEE ALSO chfn(1), login.defs(5), passwd(5).
shadow-utils 4.5 01/25/2018 CHSH(1)
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