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Debian Linux Delete Directory Command

I am new to Debian Linux and bash shell command line. How do I delete or remove a directory using bash prompt?
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I'm using a Cisco Linksys WAG320N Router to connect my OS X UNIX and Linux systems to the Web. How do I reboot my Linksys WAG series router / gateway (modem) from UNIX / Linux / OS X bash command prompt or using a shell script?
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Apple OS X: Open .Rar File / Extract rar

I know how to open .rar file under Linux, but how do you open .rar file under Apple OS X UNIX using command line and GUI tools options?
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How do I find duplicate files in a given set of directories and delete them using a shell script or a command line options? How do I get rid of double duplicates files stored in ~/foo and /u2/foo directory on a Linux operating systems? How can I remove duplicate files on a Linux based server?
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Redhat Linux: Find Out My IP Address

How do I to find out ip address on a CentOS or Fedora or Redhat Enterprise Linux server or desktop system using bash shell or command line options?
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How do I find Unix version and release number using command line options? What version, release, and maintenance level of Unix is running on my system?
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Gnome Find Drive Serial Number

How do I find out serial number information for my hard disk under Ubuntu Linux Gnome desktop environment?
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