If you would like to copy a set of files for all existing users, use the following scripting trick. It will save lots of manual work.
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/etc/shadow
You may delete a file called /etc/shadow. If you try to boot into a single user mode, system will ask for the maintenance root password. Now imagine this, you do not have a backup of /etc/shadow file. How do you fix such problem in a production environment where time is a critical factor? I will explain how to recover a deleted /etc/shadow file in five easy steps.
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