study linux website
1. LinuxCommand
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http://linuxcommand.org/
2. O’ReillyµÄLinuxÃüÁîÖ¸ÄÏĿ¼
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http://oreilly.com/linux/command-directory/
3. Linux ÊÖ²á
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http://dsl.org/cookbook/cookbook_toc.html
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Linux version
[1] 2.6.10
2.6 version number, 10 release number
[2] 2.6.10 and 2.6.11
They can differ significantly even in core components and in fundamental algorithms
[3] 2.6.11.12
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