Declares a file type for storing lines of text System unit
  var TextFile;
The TextFile type defines a file type for holding textual data.
Text files provide a simple, convenient way of storing textual data. They do provide mechanisms for reading and writing numerical data stored as text (see Write), but it is safer and wiser to use structured records when storing anything other than plain text strings.
However, text files do allow variable length records.
Related commands
Append Open a text file to allow appending of text to the end
AssignFile Assigns a file handle to a binary or text file
File Defines a typed or untyped file
Reset Open a text file for reading, or binary file for read/write
ReWrite Open a text or binary file for write access
Example code : Writing to and reading from a TextFile
  myFile : TextFile;
  text   : string;

  // Try to open the Test.txt file for writing to
  AssignFile(myFile, 'Test.txt');

  // Write a couple of well known words to this file
  WriteLn(myFile, 'Hello World');

  // Close the file

  // Reopen the file for reading

  // Display the file contents
  while not Eof(myFile) do
    ReadLn(myFile, text);

  // Close the file for the last time
Show full unit code
   Hello World