%f = new fileObject();
%f.openForRead("filename");
while(!%f.isEOF()) //until %f has reached the end of the file
{
echo(%f.readLine());
}
%f.close();
%f.openForWrite("filename"); //Clear a file and being editing it
%f.writeline("blah");
%f.close();
%f.openForAppend("filename"); //Open a file and add lines to the end of it
%f.writeline("blah");
%f.close();