GNU shtool -- The GNU Portable Shell Tool
  Copyright (c) 1994-2002 Ralf S. Engelschall <rse@engelschall.com>

  http://www.gnu.org/software/shtool/
  ftp://ftp.gnu.org/gnu/shtool/

  The GNU shtool program is a compilation of small but very stable and
  portable shell scripts into a single shell tool. All ingredients
  were in successful use over many years in various free software
  projects. The compiled shtool program is intended to be used inside
  the source tree of free software packages. There it can take over
  various (usually non-portable) tasks related to the building and
  installation of such packages.