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Note Where a program is owned by the root, setting the user ID permission will give the user the ability to execute the program with root permissions. This can be a serious security risk for any program that could effect changes-such as rm, which removes files.
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Most administration tools let you easily add, remove, or change users. For Red Hat distributions, it is recommended that you use the Red Hat User Manager to manage user accounts. You can access the Red Hat User Manager from the System Settings window in the Start Here window. It will be labeled User Manager. You can also access it from the Gnome System menu. The User Manger window will display panels for listing both users and groups (see Figure 302). You use the User Manager to manage your groups, as well as users. Click the appropriate tab to display either users or groups. Within the User and Group panels, field labels are displayed at the top for User Name, Group, the user's Full Name, Login Shell, and Home Directory. A button bar will list various tasks you can perform, including creating new users or groups, editing current ones (Properties), or deleting a selected user or group. The number of users and groups on a system can be extensive. The User Manager provides an easy-to-use
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search tool. In the box labeled Filter By, you can enter a search string. Then, when you click the Apply Filter button, only those matching users or groups are listed.
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Figure 30-2: Linuxconf user accounts To create a new user, click the New User button. This opens a window with entries for the user name, password, login shell, along with options to create a home directory and a new group for that user. Once you have created a user, you can edit its properties to add or change features. Select the user's entry and click the Properties button. This displays a window with tabbed panels for User Data, Account Info, Password Info, and Groups (see Figure 30-3). You can change basic features such as the password and login shell in the User Data panel. Account Info lets you lock an account and set an expiration date for it. Password Info will let you set password expiration limits to force a user to change the password or to render the account inactive after a certain time. On the Groups panel, you can select the groups that the user belongs to, adding or removing group membership.
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Figure 30-3: Linuxconf user information Note You can also manage users with Linuxconf, as was done in older versions of Red Hat.
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To manage users with Webmin, select the Users and Groups entry in the System panel. This displays a listing of all your users and groups. To create a new user, click on the Create a New User link below the list of users. The Create User page displays segments for User Details, Password Options, and Group Memberships. For User Details, you enter the Username (login name), the Real Name, the Shell (login shell), the Home Directory, and the Password (See Figure 30-4). For the shell entry, you can choose the shell you want from a drop-down menu. For the home directory, you can type in the directory name or click on the button next to the
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entry box labeled with three dots. This opens a file manager interface where you can click to the directory and file you want.
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Figure 30-4: Webmin user details For the password options, you can specify the period when the user needs to change the password and even set an expiration date. For group membership, you can select the primary (default) group (usually users) and add any secondary groups. Once a group is created, an entry for it will appear in the Users and Groups page. The user name will appear as a link. To make any changes or to delete the group, simply click on its name. The Edit User page will appear with entries for changing the password, changing secondary groups, or deleting the user.
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