1INCLAN: readline - read lines from a file

Usage: readline <file> <variable> [close]

The statements "readline" reads one line from the given <file>.
If necessary, the file is opened, from an already open file,
the next line is read. If the end-of-file is encountered the
<variable> is set to "EOF", and the file is closed. The file
is also closed if the "close" option is given.