Okular can import (E)PS files and show them as PDF, which isn't surprising given that it has a Ghostscript backend. What's more surprising is that it won't open those files from the commandline. At most I get an empty page. Is this an omission or is there a reason why this is less trivial to implement than I think it should be?
okular opens ps and eps files just fine from the command line. Which error do you get?
No error, just a white page. I just see that the file that fails is actually a pdf file that somehow got the eps extension. That's not a problem for ghostscript when left to its own, but probably explains why the backend fails.