write-string string &optional output-stream &key start end → string

write-line string &optional output-stream &key start end → string

string — a string.

output-stream – an output stream designator. The default is standard output.

start, end — bounding index designators of string. The defaults for start and end are 0 and nil, respectively.

write-string writes the characters of the subsequence of string bounded by start and end to output-stream. write-line does the same thing, but then outputs a newline afterwards.

 (prog1 (write-string "books" nil :end 4) (write-string "worms")) 
⊳ bookworms 
→ "books" 
 (progn (write-char #\*) 
        (write-line "test12" *standard-output* :end 5) 
        (write-line "*test2") 
        (write-char #\*) 
        nil) 
⊳ *test1 
⊳ *test2 
⊳ * 
→ NIL

*standard-output*, *terminal-io*.

read-line, write-char

write-line and write-string return string, not the substring bounded by start and end.

 (write-string string) 
≡ (dotimes (i (length string) 
      (write-char (char string i))) 

 (write-line string) 
≡ (prog1 (write-string string) (terpri))