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Introduction to Linux User Group

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Users on Linux systems are assigned to one or more groups for following reasons:

• To share files or other resource with a small number of users

• Ease of user management

• Ease of user monitoring

• User Groups can solve many problems related to large Linux (UNIX) installation.

• Group membership gives you or your user special access to files and directories or devices which are permitted to that group

A new group with the same name as the user is created by default when a new user is created in a RedHat Enterprise Linux. This new group is referred to as a private (or primary) user group.

Every user has a default group, which is usually the user’s private user group, but every user can also be a member of more than one group.

A unique integer known as a GID is associated with each group. GIDs below 500 are reserved for system groups.

Apart from the primary group, a user can be a member of another group also, which is known as supplemental groups.

              Jajish Thomason Google+
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Introduction to Linux user administration How to add a user in Linux using useradd command How to use passwd command to manage user passwords How to modify a Linux user using usermod command vHow to set Linux password aging using chage command How to remove user from Linux using userdel command The Linux user database (/etc/passwd) The Linux password database (/etc/shadow) How to create a new group in Linux using groupadd command Linux Group Database (/etc/group) file How to manage Linux user group
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