MFnPlugin

#include <stdio.h>
#include <maya/MString.h>
#include <maya/MArgList.h>
#include <maya/MFnPlugin.h>
#include <maya/MPxCommand.h>
#include <maya/MIOStream.h>
class hello : public MPxCommand
{
    public:
        MStatus doIt( const MArgList& args );
        static void* creator();
};

MStatus hello::doIt( const MArgList& args ) {
    cout << "Hello " << args.asString( 0 ).asChar() << endl;
    return MS::kSuccess;
}

void* hello::creator() {
    return new hello;
}

MStatus initializePlugin( MObject obj ) {
    MFnPlugin plugin( obj, "Autodesk", "1.0", "Any" );
    plugin.registerCommand( "hello", hello::creator );
    return MS::kSuccess;
}

MStatus uninitializePlugin( MObject obj ) {
    MFnPlugin plugin( obj );
    plugin.deregisterCommand( "hello" );
    return MS::kSuccess;
}