http://www.datsi.fi.upm.es/~frosal/sources/shc.html
  http://www.unixreview.com/columns/schaefer/
  http://www.gnu.org/software/shtool/
  http://invisible-island.net/dialog/
  http://tinyurl.com/2xmhj
  http://cfaj.freeshell.org/src/scripts/
  http://www.shelldorado.com/
  http://dione.no-ip.org/~alexis/STABLE/software/ade/adeintro.1.html
  http://www.linuxcommand.org/html_text/new_script.README.html
  http://rhols66.adsl.netsonic.fi/era/unix/award.html
  http://bashlib.sourceforge.net/