Usually, you can simply drag and drop PS and EPS files to TeXShop, copy a portion, and paste it on Keynote, as described here. However, if you prefer typing commands, here is another way.
If a plot is in a PS or EPS file by itself, here is how to import it to Keynote.
% epstopdf myfile.epsThe epstopdf comes with Ogawa's pTeX package (bigptex).
If you want to extract plots in EPS format from PS files, and IF dragging to TeXShop did not work, you may want to try this. (I have not encountered a case that this did not work, yet, though.)
% chmod +x extract-eps
% extract-eps myfile.psif extract-eps is in /usr/local/bin, or
% ~/bin/extract-eps myfile.psif extract-eps is in ~/bin . This will extract eps files included in the PS file.
% epstopdf thisplot.epsand drag and drop the converted PDF file onto your Keynote slide.
Updated 9/24/2003, Taku Yamanaka