1: ignore 14
    2: catch 18
    3: ignore 20
    4: ignore 23
    5: alias s step
    6: alias n next
    7: alias c cont
    8: alias st status
    9: alias r run
   10: alias l list
   11: alias f file
   12: alias q quit
   13: alias w where
   14: alias d delete
   15: alias p print