Do you need to read ASCII files that originate from a UNIX system? While DOS/ Windows environments separate lines with a #10#13 combination (^J^M), in UNIX systems only a #10 is inserted.
The regular Readln() does not recognize these line breaks.
A quick-and-dirty solution is loading the file into a TStringList. The TStringList.LoadFromFile() method will break up the lines - see below:
with TStringlist.Create do
begin
LoadFromFile(myfile);
SaveToFile(myfile);
Free; // don't forget to free the object
end;