It would be interesting to use a command line interface that acted like a text adventure game.

  > get file.txt
  YOU PICK UP THE FILE
  > inventory
  YOU ARE HOLDING:
  file.txt
  > gzip file.txt
  FILE.TXT HAS BEEN COMPRESSED
  > inventory
  YOU ARE HOLDING:
  file.txt (compressed)
  > drop file.txt
  YOU CAN'T PUT THAT HERE, THERE IS ALREADY A FILE.TXT HERE
  > rename file.txt file.txt.gz
  FILE.TXT HAS BEEN RENAMED
  > drop file.txt.gz
  YOU PUT DOWN FILE.TXT.GZ

Obviously not ideal, but at the very least the idea of inventory-as-clipboard would be useful on the command line.