Who can help me with a specific chmod cron job?

Who can help me with a specific chmod cron job? chmod 666 What is the difference between chmod 644 and chmod 666 and chmod 600 for outputtxtdat on websiteapache server? Little confused, in terms of security, and chmod 666 chmod 666 111 ls -l 111 -rw------- 1 ronald ronald 0 Sep 15 08:51 111 sudo chmod 666 111 ls -l 111 -rw------- 1 ronald ronald 0 Sep 15 08

chmod 666 Last Activity 10 years ago I've made it locked my self out through chmod 666 -R usrbin sept0 · EdgeMAX Routing & Switching 0 2 467 Comment Follow

king666 auto CHMOD allows permissions to be altered, but never before have I seen this command, on its own, summarily delete anything  chmod examples using octal mode : ; Permissions, Value, octal value & bit set ; rwx Read write Execute $chmod 777 file, 4+2+1, 7 rwx ; rw Read & Write $chmod 666