OpenWrite

OpenWrite["file"] opens a file for writing and returns an OutputStream object.

OpenWrite[] opens a new temporary file.

Examples

Open a file for writing:

stream = OpenWrite["output.txt"]
(* OutputStream[...] *)

Write and close:

stream = OpenWrite["output.txt"];
WriteString[stream, "Hello, World!"];
Close[stream];

Please visit the official Wolfram Language Reference for more details.