---
name: "grfdiff"
section: "1"
platform: "linux"
package: "grfcodec"
version: "6.0.0-1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/grfdiff"
---

# grfdiff(1)

A tool to create a binary GRF diff from to GRFs.

## NAME

**GRFDiff** – A tool to create a binary GRF diff from to GRFs.

## SYNOPSIS

**grfdiff** \[**-hnxyv**\] \[**-l** *numbers*\] \[**-o** *GRF‐File*\] *Original‐GRF‐file* *New‐GRF‐file*

Compare the two GRF files and produce a GRD file containing only the sprites from the second file that are different from the first file.

GRFDiff makes a .GRD file with the same basename as the new GRF file.

## OPTIONS

- **-h**

  Display the help message.

- **-l** *numbers*

  Save the sprites with these numbers in the .GRD instead of finding the modified sprites.  With this option, the first GRF file can be omitted.

  Format of the numbers: \<from1\>\[‐\<to1\>\]\[,\<from2\>\[‐\<to2\>\]\]... e.g.  1‐5,8,20‐31 (must be increasing numbers).

- **-n**

  Only show a list of modified sprites, don't make a .GRF file.

- **-x**

  Make a self‐extracting (.EXE) file instead of a .GRD.

- **-y**

  Answer 'y' to all questions.

- **-v**

  Display the version.

You can specify several sets of GRF files along with their **-l** options by separating them with a double‐dash \`--'. The result will be written to a single .GRD file.  Only **-l** is valid after the first set.

## SEE ALSO

The documentation in */usr/share/doc/grfcodec/*

## AUTHOR

GRFDiff was written by Josef Drexler.

This manual page was written by Remko Bijker.

## COPYRIGHT

GRFDiff is Copyright (C) 2003 by Josef Drexler \<jdrexler@uwo.ca\>