the large file challenge

[Sadhunathan Nadesan]

I got this suggestion from Jeanne A. E. DeVoto ~ jeanne at runrev.com

repeat
     read from stdin until "mystic_mouse"
     if the result is not empty then add 1 to the_counter -- found it
     else exit repeat -- encountered end of file, no more occurrences
end repeat
put the_counter


But I was not able to make it actually run.

Any suggestions?