string files[], lines[], buf, wrk, ProjectDir, OutputFile;
int n, ret;

if(schematic) schematic(S) wrk=S.name;
if(board) board(B) wrk=B.name;
ProjectDir=filedir(wrk);
dlgMessageBox( "Project directory = " + ProjectDir );

OutputFile = ProjectDir + "screensize.txt";
dlgMessageBox( "OutputFile = " + OutputFile );

n = fileglob(files, "/usr/sbin/");
if( n > 0 ) {
    dlgMessageBox( "linux" );
	ret = system( "xdpyinfo | awk '/dimensions/{print $2}' > " + OutputFile );
	if( ret == 0 ) {
		int nLines = fileread(lines, OutputFile);
		for( int i=0; i<nLines; i++ ) {
	    	dlgMessageBox( lines[i] );
		}
    } else {
    	sprintf( buf, "exit code: %d\n", ret );
    	dlgMessageBox( buf );
	}
}

n = fileglob(files, "c:\\windows\\");
if( n > 0 ) {
    dlgMessageBox( "windows" );
    ret = system( "cmd.exe /c wmic desktopmonitor get screenheight > \"" + OutputFile + "\"" );
    if( ret == 0 ) {
		int nLines = fileread(lines, OutputFile);
		for( int i=0; i<nLines; i++ ) {
	    	dlgMessageBox( lines[i] );
		}
    } else {
    	sprintf( buf, "exit code: %d\n", ret );
    	dlgMessageBox( buf );
    }
}

output( OutputFile, "twD" ) { // wD - delete this file when ending the EAGLE session
    printf("\n"); // print something to create the file
};