[ubuntu] I think my terminal is broken...or my brain is.

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http://ubuntuforums.org – so I started reading up on how to program in C++ yesterday, and at the end of the first section you end up with a hello world program. I wrote the program in emacs and saved it as a .cpp file I went to open it through the terminal and tried to change the CD to get to the folder it was saved in, the terminal returned that the directory didn't exist which is a complete load. now, from the home directory if I type command ls it does list my downloads folder but if I command cd /home/downloads or cd /downloads I get the same response. now onto my second problem. since I wasn't able (Hardware)