Usage Tutorial

Taken from original website, in order to ensure availability of this information for the future

#GCMTool gcmtool is the primary program in the gcmtools suite. It is the program that you use to work directly with GameCube DVD images (.gcm and .iso).

If you run gcmtool with a GCM as a commandline argument, it'll dump information about your game:

Mookid:~ spike$ gcmtool naruto2_JAP.gcm 
Filename:       naruto2_JAP.gcm
System ID:      G (Gamecube)
Game ID:        NU
Region:         J (Japan/NTSC)
Maker Code:     DA (Tomy)
Game Name:      NARUTO2
DOL offset:     128768
Apploader:      9280
ApploaderSize:  6484
FST:            1903360
File count:     348

To see all of the available commandline options and information about them, run gcmtool with the -? (or --help) option:

gcmtool -?

Usage:  gcmtool [ options ] <filename>

Use -? for extended usage.

    Options:
        -e <source> <dest_dir>
                Extracts the file from <source> (in the GCM) to <dest_dir> (local filesystem)

Its most basic use, it takes one argument; a gcm:

$ gcmtool d3-thug.iso 
Filename:       d3-thug.iso
System ID:      G (Gamecube)
Game ID:        TD
Region:         E (USA/NTSC)
Maker Code:     52 (Activision)
Game Name:      Tony Hawk's Underground
DOL offset:     125760
Apploader:      9280
ApploaderSize:  6452
FST:            3159456
File count:     2165

The first handful of fields are self explanitory. The rest are just for general info if you're gonna do some more low-level hacking.

#GCMBnrTool gcmbnrtool is used for working with opening.bnr found in the root directory of all GCMs. It contains extra information about the developer and game including a brief description of the game and a bitmap icon. gcmbnrtool can modify any of that information (unfortunately only in ASCII. So if you wanna put information in japanese, you're SOL), as well as extract the icon to a .raw (for photoshop) or even a .ppm (portable-pixel-map) format and inject your own custom icon (currently only from a .raw).

By default, gcmbnrtool will print out information about the .bnr:

Mookid:~ spike$ gcmbnrtool prince_opening.bnr 
Version:        1
Name:           Prince of Persia
Developer:      UBISOFT Entertainment
Full Name:     
Full Developer: Prince of Persia: The Sands of Time
Description:    ? 2003 UBISOFT Entertainment

To see usage, run gcmbnrtool with the -? commandline option.