mkdir /home/engines chgrp engines /home/engines
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Then the read, write, and execute permissions for the group level should be set:
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chmod g+rwx /home/engines
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Any member of the engines group can now access the /home/engines directory and any shared files placed therein. This directory becomes a shared directory for the group. You can, in fact, use the same procedure to make other shared directories at any location on the file system. Files within the shared directory should also have their permissions set to allow access by other users in the group. When a user places a file in a shared directory, permissions on that file need to be changed to allow other members of the group to access it. A read permission will let others display it, write lets them change it, and execute lets then run it (used for scripts and programs). The following example first changes the group for the mymodel file to engines. Then it copies the mymodel file to the /home/engines directory and then sets the group read and write permission for the engines group.
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$ chgrp engines mymodel $ cp mymodel /home/engines $ chmod g+rw /home/engines/mymodel
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Managing Groups with the Red Hat User Manager
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You can add, remove, and modify any groups easily with the Red Hat User Manager. First access the Red Hat User Manager by clicking the User Manager icon in the System Settings window, listed on the Start Here window. Then click on the tabbed panel labeled Groups in the Red Hat User Manager window. All your current groups will be listed. There will be two fields for each entry, the Group Name and the Group Members (see Figure 30-6).
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Figure 30-6: The Linuxconf Group panel To add a group, just click the New Group button. This opens a small window where you can enter the group name. When you click the Refresh button, the new group will be listed in the User Manager's Group listing. To add users as members of the group, select the group's entry and click the Properties button. This opens a window with tabbed panels for both the Group Data and the Group Users. The Groups Users panel will list all current users with checkboxes beside their name (see Figure 30-7). Click the checkboxes for the user you want to add to the group. Should you want to remove a user as a member of the group, click its checkbox to remove its checkmark. Click Apply to apply your changes.
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Figure 30-7: Linuxconf Group Specification panel
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Should you want to remove a group, just select its entry in the User Manger's Group panel and then click the Delete button. Note You can also mange groups with Linuxconf. Be sure to check the permissions and group ownership for any group directory that you create. The group permissions need to be set to read, write, and execute for full access. The read permission will let users list files in the directory, the write will let users add and remove files, and the execute permission lets users change to that directory. As the root user, you can use chmod to set these permissions:
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chmod 775 /home/golphpros
Then, to change the group ownership, you use chgrp, as shown here:
chgrp golphpros /home/golphpros
In Gnome, you can check and change permission with the Gnome file manager by rightclicking on the directory name and selecting Properties. Then select the Permissions panel. For full access, make sure the row of Group Permission buttons is selected. Also, select the group from the list of groups in the Group drop-down menu-in this example, golphpros.
Managing Groups Using Webmin
To manage groups in Webmin, you select the Users and Groups entry in the Systems panel to display the Users and Groups page. Move down to the group listings. Here, groups are listed with their names functioning as links to an Edit Group page for that group. In the Edit Group page, you can add a password, change the ID, or add new users to the group. To create a group, click on the Create New Group link following the Group list on the Users and Groups page. This opens a Create Group page where you can add a group name, add a password, and add users to the group. The group ID is provided for you, which you can then change if you wish. When you add users to a group, a new window opens up with two panes, one listing all users and the other for the users you have selected for this group. Each user name is a link. Clicking on a user name in the All Users lists adds it to the Selected Users list. Clicking on a name in the Selected Users list removes it from that list. When you click the OK button, the names you have selected will appear in the Members box on the Create Group page.