If you want the subdirectory to have a different name from the postscript file, add that name to the end of the command line. If you don't like the sample template, you can make your own copy of it and modify it to suit your needs. Notes These and other options are described on the webify man page. Type man webify to view it. You do not need graphics capability to run webify.
Additional documentation is also available via the Web.
There are some relevant bugs in Ghostscript, which is the program webify uses to convert the Postscript file to GIF format. One of these bugs causes hostscript to loop forever when converting a file whose contents extend beyond page boundaries, e.g., when you're over-cropping pages. Adjusting the cropping parameters in the webify template file is the only currently-known way to get around this problem.