Entering a '!' (exclamation mark) at the ftp> prompt starts a shell. You can then use any Unix operating system command before typing "exit" at the system prompt and returning to the ftp prompt. For example:
   ftp> !
   cal 7 1990
      July 1990
    S  M Tu  W Th  F  S
    1  2  3  4  5  6  7
    8  9 10 11 12 13 14
   15 16 17 18 19 20 21
   22 23 24 25 26 27 28
   29 30 31
   exit
   exit
   ftp>
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