what is the command to display .eps files?

In general, you can use open from the terminal to open any file with its default application (see this SO question). open is Mac OS-specific. On GNU/Linux, the equivalent is usually xdg-open.

Also, for your reference, you can try to find out what type of file a file really is (regardless of its extension) using the file command.

Files with the .eps extension are usually encapsulated postscript. You can view them with gv:

gv t-0.8.eps

Or with your favorite PDF viewer:

evince t-0.8.eps

Or even with an image editor

gimp t-0.8.eps