def processCommandList():

    try:
        # Assume that maya.cmds.about and maya.cmds.internalVar are already registered
        #
        commandListPath = os.path.realpath( os.environ[ 'MAYA_LOCATION' ] )
        platform = maya.cmds.about( os=True )
        commandListPath = os.path.join( commandListPath, commandListLocations[platform], 'commandList' )

        file = open( commandListPath, 'r' )
        for line in file:
            commandName, library = line.split()
            if not commandName in maya.cmds.__dict__:
                maya.cmds.__dict__[commandName] = __makeStubFunc( commandName, library )
    except:
        sys.stderr.write("Unable to process commandList %s" % commandListPath)
        raise

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Process the "commandList" file that contains the mappings between command names and the
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/maya/app/commands.py/processCommandList