    Remember or display program locations.
    
    Determine and remember the full pathname of each command NAME.  If
    no arguments are given, information about remembered commands is displayed.
    
    Options:
      -d		forget the remembered location of each NAME
      -l		display in a format that may be reused as input
      -p pathname	use PATHNAME is the full pathname of NAME
      -r		forget all remembered locations
      -t		print the remembered location of each NAME, preceding
    		each location with the corresponding NAME if multiple
    		NAMEs are given
    Arguments:
      NAME		Each NAME is searched for in $PATH and added to the list
    		of remembered commands.
    
    Exit Status:
    Returns success unless NAME is not found or an invalid option is given.
