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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
¡¡¡¡LinuxÊÖ²áÊʺÏShellµÄѧϰºÍShell½Å±¾±àд¡£ÕâÀïÊÇѧϰLinuxÃüÁîµÄ×îºÃ×ÊÔ´£¬µ±ÄãѧϰÁËһЩÃüÁîÖ®ºó£¬ÄãÏëÖªµÀÈçºÎÈ¥±à¼­Ò»¸öÎļþ£¬ÄÇôLinuxÊÖ²á¾Í½éÉÜÁËÎı¾±à¼­¡£
      http://dsl.org/cookbook/cookbook_toc.html
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