(setq fmode (nth 8 (file-attributes "/Users/sk/a.js")))
(message "file mode is as, - %s" fmode)
(string-match "^.\(...\)\(...\)\(...\)$" fmode)
(message "User permission -  %s" (match-string 1))
(message "Group permission - %s" (match-string 2))
(message "Others permission - %s" (match-string 3))

file mode is as, - -rw-r--r--
User permission -  (se
Group permission - tq
Others permission - fmo