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Running FEBio on Linux or Mac is as easy as opening up a shell window and typing FEBio on the command line. However, you may need to define an alias to the folder that contains the FEBio executable if you want to run FEBio from any folder on your system. Since this depends on your shell, you need to consult your Linux documentation on how to do this. E.g. if you are using c-shell, you can define an alias as follows:

alias febio '/path/to/febio/executable/'

If you don't want to define this alias every time you open a shell window, you can place it in your shell start up file (e.g. .cshrc for c-shell).