asp.net barcode scanner Managing Users in Software

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Managing Users
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Managing Groups Using groupadd, groupmod, and groupdel
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You can also manage groups with the groupadd, groupmod, and groupdel commands.
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With the groupadd command, you can create new groups. 2 When you add a group to the system, the system places the group s name in the /etc/group file and gives it a group ID number. If shadow security is in place, changes 2 are made to the /etc/gshadow file. The groupadd command only creates the group category. You need 2 to add users to the group individually. In the following example, the groupadd command creates the engines group:
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# groupadd engines You can delete a group with the groupdel command. In the next example, the engines group is deleted: # groupdel engines
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You can change the name of a group or its ID using the groupmod command. Enter groupmod -g with the new ID number and the group name. To change the name of a group, you use the -n option. Enter groupmod -n with the new name of the group, followed by the current name. In the next example, the engines group has its name changed to trains: # groupmod -n trains engines
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Controlling Access to Directories and Files: chmod
Each file and directory in Linux contains a set of permissions that determine who can access them
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54 Red Hat Linux Pocket Administrator
and how. You set these permissions to limit access in one of three ways: You can restrict access to yourself alone, you can allow users in a pre-designated group to have access, or you can permit anyone on your system to have access. You can also control how a given file or directory is accessed.
Permissions
A file and directory may have read, write, and execute permissions. When a file is created, it is automatically given read and write permissions for the owner, enabling you to display and modify the file. You may change these permissions to any combination you want. A file could also have read-only permission, preventing any modifications.
Permission categories
Three different categories of users can have access to a file or directory: the owner, the group, and all others not belonging to that group. The owner is the user who created the file. Any file you create, you own. You can also permit a group to have access to a file. Often, users are collected into groups. For example, all the users for a given class or project could be formed into a group by the system administrator. A user can grant access to a file to the members of a designated group. Finally, you can also open up access to a file to all other users on the system. In this case, every user not part of the file s group could have access to that file. In this sense, every other user on the system makes up the others category. If you want to give the same access to all users on your system, you set the same permissions for both the group and the others. That way you include both members of the group (group permission) and all those users who are not members (others permission).
read, write, execute permissions
Each category has its own set of read, write, and execute permissions. The first set controls the user s own access to his or her files the owner access. The second set controls the access of the group to a user s files. The third
Managing Users
set controls the access of all other users to the user s files. The three sets of read, write, and execute permissions for the three categories owner, group, and other make a total of nine types of permissions. The ls command with the -l option displays detailed information about the file, including the permissions. In the following example, the first set of characters on the left is a list of the permissions set for the mydata file:
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