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There should be a space in the command you are trying to run, try using cat /etc/version, notice the space between cat command and the directory /etc/version. Currently the latest version is 16. Let me know if that works.
My bad. For others, if you had same problem,
Edison is linux OS
Putty terminal /SSH tool for linux . (Not windows command prompt / shell)
To get familiar with Linux terminal commands search for Ssh commands.