broadcast-stream-streams     file-author       pathnamep                     
  close                        file-namestring   probe-file                    
  compile-file                 file-write-date   rename-file                   
  compile-file-pathname        host-namestring   streamp                       
  concatenated-stream-streams  load              synonym-stream-symbol         
  delete-file                  logical-pathname  translate-logical-pathname    
  directory                    merge-pathnames   translate-pathname            
  directory-namestring         namestring        truename                      
  dribble                      open              two-way-stream-input-stream   
  echo-stream-input-stream     open-stream-p     two-way-stream-output-stream  
  echo-stream-ouput-stream     parse-namestring  wild-pathname-p               
  ed                           pathname          with-open-file                
  enough-namestring            pathname-match-p                                

        Figure 21–7: Operators that accept either Open or Closed Streams      

 clear-input              output-stream-p         read-char-no-hang          
 clear-output             peek-char               read-delimited-list        
 file-length              pprint                  read-line                  
 file-position            pprint-fill             read-preserving-whitespace 
 file-string-length       pprint-indent           stream-element-type        
 finish-output            pprint-linear           stream-external-format     
 force-output             pprint-logical-block    terpri                     
 format                   pprint-newline          unread-char                
 fresh-line               pprint-tab              with-open-stream           
 get-output-stream-string pprint-tabular          write                      
 input-stream-p           prin1                   write-byte                 
 interactive-stream-p     princ                   write-char                 
 listen                   print                   write-line                 
 make-broadcast-stream    print-object            write-string               
 make-concatenated-stream print-unreadable-object y-or-n-p                   
 make-echo-stream         read                    yes-or-no-p                
 make-synonym-stream      read-byte                                          
 make-two-way-stream      read-char                                          

             Figure 21–8: Operators that accept Open Streams only