ReadLine

ReadLine[stream] reads a line of text from a stream and returns it as a string.

ReadLine[proc] reads a line from an external process.

Examples

Read a line from a file:

stream = OpenRead["file.txt"];
ReadLine[stream]
(* "first line of file" *)

Close the stream when done:

Close[stream]

Please visit the official Wolfram Language Reference for more details.