Gsymcheck is a symbol checker.  Give it a symbol file and it will
go through and verify that all the proper attributes exist and
contain the correct values.  Gsymcheck is a part of gEDA.

  gEDA is a collection of tools which are used to make electrical
circuit design, simulation and prototyping/production easier/doable.
gEDA is a project, which was started because of the lack of free EDA
tools for UNIX.  All of the tools in gEDA are released under the GNU
Public License version 2 (GPL).