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Error: Can't open display:

I am working my way through 'The linux command line' (http://linuxcommand.org/tlcl.php) . Since I don't have a local linux environment and I have to work in windows , I am telnetting into an Ubuntu 14.4 LTS instance on EC2 , with putty. On page 114 , when I run the xlogo command I get: . . .阅读更多