8. File Contents


Reading Lines with Continuation Characters

Counting Lines (or Paragraphs or Records) in a File

;; Should we count the last line, if it does not end with a newline?
;; This version counts:
(with-open-file (stream #p"numbers.html")
  (loop for line = (read-line stream nil)
        while line
        count t))
;; and this does not:
(with-open-file (stream #p"numbers.html")
  (loop for (line missing-newline-p) =
            (multiple-value-list (read-line stream nil))
        while line
        count (not missing-newline-p)))

Processing Every Word in a File

Reading a File Backwards by Line or Paragraph

Trailing a Growing File

Picking a Random Line from a File

Randomizing All Lines

Reading a Particular Line in a File

Processing Variable-Length Text Fields

Removing the Last Line of a File

Processing Binary Files

Using Random-Access I/O

Updating a Random-Access File

Reading a String from a Binary File

Reading Fixed-Length Records

Reading Configuration Files

Testing a File for Trustworthiness

Program: tailwtmp

Program: tctee

Program: laston