To view PostScript (.ps) files, you need to use a program called gv. PDF (.pdf) files can be viewed using acroread or xpdf.
By default, xpdf will save the .pdf file to a postscript format, which you can then print. When you choose the print option, you will see a destination for the file to be saved rather than a print command. You can subvert this by piping the output of the save operation to a printer. To do this, you will need to replace the existing path in the print box with the print command below.