Twelve Days of Shell

Looks nice but it's rejecting valid commands as incorrect. Like when it told me to search for "laugh" I ran

  grep laugh *

There's only one file in the directory. So that's a correct answer but the game wants me to run

  grep laugh night-before-christmas.txt 

It's like those weird interviewers who have a specific answer in mind and they'll accept nothing other than the answer they have in mind.