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4.3.7 Using a Shell

More info: http://www.encyclopedia-online.info/Unix_shell
http://www.chiark.greenend.org.uk/~sgtatham/putty/
http://directory.google.com/Top/Computers/Internet/Access_Providers/Unix_Shell_Providers/
http://www.panix.com/shell.html
http://www.shellux.net/