GNU gv - View PostScript and PDF documents using ghostscript.
This is the First edition of the GNU gv Manual, updated for gv version 3.6.6.
Copyright © 1995, 1996, 1997 Johannes Plass
Copyright © 2004 José E. Marchesi
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 3 or any later version published by the Free Software Foundation.