Task

(Over)write a file so that it contains a string.



The reverse of Read entire file—for when you want to update or create a file which you would read in its entirety all at once.




(with-open-file (str "filename.txt"
                     :direction :output
                     :if-exists :supersede
                     :if-does-not-exist :create)
  (format str "File content...~%"))