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  1. Synopsis:
  2.    $cexist(<command>)
  3.  
  4. Technical:
  5.    This function tells wether or not a built-in command exists.
  6.    
  7. Practical:
  8.    This can be used to emulate a built-in command in older versions of epic
  9.    that may not support it.
  10.  
  11. Returns:
  12.    1   If the built-in command <command> exists
  13.    0   If <command> doesn't exist
  14.    
  15. See Also:
  16.    fnexist(6)
  17.  
  18.