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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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References

Image http://tldp.org/HOWTO/User-Authentication-HOWTO/The User-Authentication HOWTO describes how user and group information is stored and used for authentication.

Image http://tldp.org/HOWTO/Shadow-Password-HOWTO.htmlThe Shadow-Password HOWTO delves into the murky depths of shadow passwords and even discusses why you might not want to use them.

Image http://tldp.org/HOWTO/Security-HOWTO/A must-read HOWTO, the Security HOWTO is a good overview of security ...

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