WriteLnFile
From the Scripting Manual
function WriteLnFile(FileName, Data: string): boolean; Parameter Info: FileName (String): File located in your Soldat Server folder. Data (String): Text to be written to FileName. Description: This function will write a single LINE to (FileName) in your Soldat Server directory
Examples
begin
WriteLnFile('scriptlog.txt','I am a line! Hear me roar!');
//I am a line! Hear me roar! will now be written to scriptlog.txt
end;