I've shared this before, but if you're new to Linux File permissions checkout http://chmodcalc.com/.
Chmod Calculator for Linux File Permissions ← Notes · Nov 22, 2014 I've shared this before, but if you're new to Linux File permissions checkout chmodcalc.com KAIYUN.COM·开云「中国」官方网站 kaiyun.com集团，成立于2006年，是一家集研发、生产、销售、服务为一体的远程控制、恒温器、智能设备、主控板OEM和ODM的专业制造商和一站式解决方案提供商。 (opens in a new tab)