EOF

function Eof(TextFile);

The Eof function returns true if the file given by FileHandle is at the end.
The file must have been assigned, and opened with Reset.

Example:

var
  myFile : TextFile;

begin
  AssignFile(myFile, 'Test.txt');
  ReWrite(myFile);

  WriteLn(myFile, 'Hello');
  WriteLn(myFile, 'World');
  CloseFile(myFile);
  Reset(myFile);

  while not Eof(myFile) do
  begin
    ReadLn(myFile);
  end;

 CloseFile(myFile);
end;