tell/1
tell(Filename)
Open file for output.
Remarks
tell/1 opens the disk file FileName for writing and attaches the output stream to it. If a file called FileName already exists on the disk, tell/1 will erase its contents.
Example
tell("dd.txt"),
write("line 1\n"),
write("line 2\n"),
write("line 3\n"),
told,
see("dd.txt"),
readln(Str1),
seen,
display(Str1).