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-s shell -u userid Group Management Commands
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Table 30-1: User and Group Management Commands Description Creates a new group. Removes a group. Modifies a group.
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groupadd groupname options Group Management Commands groupdel groupname options groupmod groupname options useradd, usermod Options -g gid -n groupname -f -r
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Change a group ID. Change a group name. In Red Hat, detects if group already exists. In Red Hat, creates a system group, one lower than the group minimum specified in login.defs.
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Once you add a new user login, you need to give the new login a password. Password entries are placed in the /etc/passwd and /etc/shadow files. Use the passwd command to create a new password for the user, as shown here. The password you enter will not appear on your screen. You will be prompted to repeat the password. A message will then be issued indicating that the password was successfully changed.
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# passwd chris Changing password for user chris New UNIX password: Retype new UNIX password: passwd: all authentication tokens updated successfully #
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The usermod command enables you to change the values for any of these features. You can change the home directory or the user ID. You can even change the user name for the account. When you want to remove a user from the system, you can use the userdel command to delete the user's login. In the next example, the user chris is removed from the system:
# userdel -r chris
Note You can also add a new user to the system with the adduser utility. The Red Hat version of adduser takes as its argument the user name for the account you are creating. adduser has options similar to useradd.
Managing Groups
You can manage groups using either shell commands or window utilities like Linuxconf. The system file that holds group entries is called /etc/group. The file consists of group records, with one record per line and its fields separated by colons. A group record has four fields: a group name, a password, its ID, and the users who are part of this group. The Password field can be left blank. The fields for a group record are as follows: Group name Name of the group; must be unique
Group name Password Group ID Users
Name of the group; must be unique Usually an asterisk to allow anyone to join the group; a password can be added to control access Number assigned by the system to identify this group List of users that belong to the group
Here is an example of an entry in an /etc/group file. The group is called engines, there is no password, the group ID is 100, and the users who are part of this group are chris, robert, valerie, and aleina.
engines::100:chris,robert,valerie,aleina
As in the case of the /etc/passwd file, you can edit the /etc/group file directly using a text editor, unless you have implemented shadow security. Instead of using either Linuxconf or groupdel, you could simply delete the entry for that group in the /etc/group file. This can be risky, however, if you make accidental changes. If you have implemented shadow security measures, then group entries are kept in an encrypted /etc/gshadow file. You cannot edit this file. Changes can only be made through a utility like groupmod. As for users, you can also create a home directory for a group. Several administration utilities like Linuxconf support this feature. To do so manually, you simply create a directory for the group in the /home directory and change its group to that of the group, along with allowing access by any member of the group. The following example creates a directory called engines and changes its group to that of the engines group:
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