RosettaCodeData/Task/Take-notes-on-the-command-line/Mathematica/take-notes-on-the-command-line.math

If[Length[$CommandLine < 11], str = OpenRead["NOTES.TXT"];
 Print[ReadString[str, EndOfFile]]; Close[str],
 str = OpenAppend["NOTES.TXT"]; WriteLine[str, DateString[]];
 WriteLine[str, "\t" <> StringRiffle[$CommandLine[[11 ;;]]]];
 Close[str]]