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(defpackage backlight (:use :cl) (:export :main)) (in-package :backlight) (defun main() (if (= (length uiop:*command-line-arguments*) 1) (let ((percent (parse-integer (car uiop:*command-line-arguments*) :junk-allowed t))) (if (and percent (> percent 0) (<= percent 100)) (let ((max (parse-integer (alexandria:read-file-into-string "/sys/class/backlight/intel_backlight/max_brightness")))) (alexandria:write-string-into-file (format nil "~d" (round (/ (* percent max) 100))) "/sys/class/backlight/intel_backlight/brightness" :if-exists :supersede)) (syntax-error))) (syntax-error) )) (defun syntax-error() (format t "Syntax error~%Usage: backlight <percent>~%") ;;(quit) )