This is net2sh, a small flow-based programming system for the shell.
  Sam Watkins <sam@nipl.net>
  public domain

to try it:

  make
  eg/file_count
  eg/fmt -width=50 </usr/share/dict/words | head
  net2sh <net2sh
  net2dot <net2sh

to build graphs:

  make g
  qiv g/ g/eg/ g/sub/

to install symlinks:

  make devinst

to install:

  make install

helpful packages:

  graphviz
  ghostscript
  latex2html  (for pstoimg)
  evince
  qiv

  sudo apt-get install graphviz ghostscript latex2html evince qiv