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Full Discussion: SU command
Top Forums UNIX for Dummies Questions & Answers SU command Post 71843 by MizzGail on Monday 16th of May 2005 10:37:15 AM
Old 05-16-2005
In its most basic form, sudoers looks like this:
# sudoers file.
#This file MUST be edited with the 'visudo' command as root.
#See the man page for the details on how to write a sudoers file.
#
# Host alias specification
Host_Alias PROD=MyBigFatServer

Defaults logfile=/var/log/sudo.log

# User alias specification
# JACK - Jack

User_Alias FETCHING=JACK

# Cmnd alias specification
Cmnd_Alias DO_FETCHING=/bin/GetaPailofWater

# User privilege specification
FETCHING = NOPASSWD:DO_FETCHING

This means that Jack can execute the command GetaPailofWater as root with no password by typing the following at the command line.

# sudo GetaPailofWater

You can put this in a script in the same format.

The sudo log will show this as JACK performing the command as root.
If your audit process will not let you do this (this command HAS to be executed as JILL) there is a way to say that JACK can to this command as JILL by adding the runas alias and -u JILL on the command. We had difficulty getting this to work on our older servers, so we don't use it. The example above meets our audit requirements and allows JACK to do his thing.
 

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LEARN ABOUT MINIX

chsh

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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