PAM is a flexible mechanism for authenticating users. For example, you do not allow users to reuse recent passwords. This can be accomplished by using the remember option for the pam unix PAM module.
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password file
The useradd command is used to create a new user or update default new user information from the command line. However, sometimes you need to create a large number of users or import usernames from a text file. You can use newusers command, which update and create new users in batch.
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