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Linux: Prevent From Using Or Reuse Same Old Passwords

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 or pam_unix2 (part of certain enterprise distro) PAM module. In this quick, blog post I am going to explain how to restrict use of previous passwords using pam_unix.so.
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Linux: How To Create Multiple Users Accounts in Batch

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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