The ReadLine(file) command reads a string containing all the characters from the current file position to the first newline character or the end of file.  The characters are returned as a string.

If the current file position is the end of the file, a call to ReadLine returns NULL, but ReadLine does not automatically close file. This behavior is different from readline.

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{WriteLine}\right]\left(''testfile''\,''This\; is\; a\; test''\right)$

$15$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{WriteLine}\right]\left(''testfile''\,''This\; is\; also\; a\; test''\right)$

$20$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{Close}\right]\left(''testfile''\right)$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{ReadLine}\right]\left(''testfile''\right)$

$''This\; is\; a\; test''$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{ReadLine}\right]\left(''testfile''\right)$

$''This\; is\; also\; a\; test''$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{ReadLine}\right]\left(''testfile''\right)$

$\mathrm{FileTools}\left[\mathrm{Remove}\right]\left(''testfile''\right)$