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Linux is a very powerful operating system and, consequently, is sometimes complex to understand and configure properly.
Fortunately, all Linux installations give the system administrator access to a number of local document sources like manual pages, info pages and readme files for individual applications.
In addition to those resources, a lot of very relevant information can also be found online. For example,
- The Linux Documentation Project
- The CentOS forum and Redhat documentation
- Freenode, which is an IRC network.
Naturally, a lot of system administrators also learn how to use Google properly in order to find the information they require out of the myriad of forums, blogs and websites that exist.
Finally, sometimes a system administrator needs to notify users of changes and disruptions of service.
