gparm is a program (a "script" written in the Perl language) for generating large numbers of input files for other programs. Although initially designed to facilitate large-scale parametric analysis of building energy performance using software such as EnergyPlus and DOE-2, it works for any program that reads its input from a plain text (ASCII) file. The name gparm is an abbreviation/portmanteau for general parametrics. gparm combines a user-developed input template file that contains various replaceable parameters with a parameter file that holds a table of the parameter values for which independent input files are desired. The template file may also contain programming logic (in the Perl language) that is driven by the specific parameter values in the parameter file, allowing for the development and management of very complex input files for other programs.