Controlling login attempts with PAM (Pluggable Authentication Module)

It is generally a good and sensible practice to lock out a user after a number of failed login attempts, with some exceptions. You don't want to give an intruder unlimited attempts, but you don't want clumsy users pestering you all the time for login resets. And users who wish to play practical jokes locking out other users by trying...

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Working with User and Group Management

Group Commands Group definitions reside in the /etc/group file. A standard Linux /etc/group file contains the following information: groupname:x:groupid:user list. The “x” in the group definition file is a deprecated placeholder for a group password. To find out which groups you belong to, type groups at a command prompt. $...

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