# contributor: Xah Lee (XahLee.org)
# name: read lines of a file
# key: x-file
# --
(defun read-lines (filePath)
  "Return a list of lines in FILEPATH."
  (with-temp-buffer
    (insert-file-contents filePath)
    (split-string
     (buffer-string) "\n" t)) )

;; process all lines
(mapc
 (lambda (aLine)
   (message aLine) ; do your stuff here
   )
 (read-lines "inputFilePath")
)