Read one line from an open file or TCP stream into a string variable. TCP reads are non-blocking: an empty string if no complete line is waiting.
LINE INPUT #fn, var$
#fn - open disk file or OPEN “TCP:host:port” var$ - string variable
Example:
OPEN "N.TXT" FOR INPUT AS #1
LINE INPUT #1, A$
CLOSE #1
Source: docs/help/line-input.txt inmmcore. On the computer, typeHELP LINE INPUT.