pic2graph - convert a PIC diagram into a cropped image


   pic2graph [ -unsafe ] [ -format fmt ] [ -eqn delim ]


   Reads  a  PIC  program  as input; produces an image file (by default in
   Portable Network Graphics format) suitable for the Web as output.  Also
   translates  eqn(1)  constructs, so it can be used for generating images
   of mathematical formulae.

   PIC is a rather expressive graphics minilanguage suitable for producing
   box-and-arrow  diagrams of the kind frequently used in technical papers
   and textbooks.  The language  is  sufficiently  flexible  to  be  quite
   useful  for  state  charts,  Petri-net  diagrams,  flow  charts, simple
   circuit schematics, jumper layouts, and  other  kinds  of  illustration
   involving  repetitive  uses  of  simple  geometric  forms  and splines.
   Because PIC descriptions are procedural and object-based, they are both
   compact and easy to modify.

   The PIC language is fully documented in Making Pictures With GNU PIC, a
   document which is part of the groff(1) distribution.

   Your input PIC code should not be wrapped with the .PS and  .PE  macros
   that normally guard it within groff(1) macros.

   The  output image will be clipped to the smallest possible bounding box
   that contains all the black pixels.  Older versions of convert(1)  will
   produce  a  black-on-white  graphic; newer ones may produce a black-on-
   transparent graphic.  By specifying command-line options to  be  passed
   to   convert(1)  you  can  give  it  a  border,  force  the  background
   transparent, set the image's pixel density,  or  perform  other  useful

   This  program uses pic(1), eqn(1), groff(1), gs(1), and the ImageMagick
   convert(1) program.  These programs must be installed  on  your  system
   and accessible on your $PATH for pic2graph to work.


          Run  pic(1)  and  groff(1) in the 'unsafe' mode enabling the PIC
          macro sh to execute  arbitrary  commands.   The  default  is  to
          forbid this.

   -format fmt
          Specify  an  output format; the default is PNG (Portable Network
          Graphics).  Any format that convert(1) can emit is supported.

   -eqn delim
          Change the fencepost characters that delimit  eqn(1)  directives
          ($ and $, by default).  This option requires an argument, but an
          empty string is  accepted  as  a  directive  to  disable  eqn(1)

   Command-line  switches  and  arguments  not  listed above are passed to


   /usr/share/groff/1.22.3/tmac/eqnrc  The eqn(1) initialization file.


          The directory in which temporary files will be created.  If this
          is  not set pic2graph searches the environment variables TMPDIR,
          TMP, and TEMP (in that order).  Otherwise, temporary files  will
          be created in /tmp.


   Due  to changes in the behavior of ImageMagick convert(1) that are both
   forward and backward-incompatible, mismatches  between  your  pic2graph
   and  convert(1)  versions  may  produce  zero-sized or untrimmed output
   images.  For this version of pic2graph  you  will  need  a  version  of
   convert(1)  that supports the -trim option; older versions of pic2graph
   used -crop 0x0, which no longer has trimming behavior.


   eqn2graph(1),   grap2graph(1),   pic(1),   eqn(1),   groff(1),   gs(1),


   This documentation is released to the public domain.


   esr@thyrsus.com  Eric  S. Raymond , based on a recipe by W. Richard


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.