755 = chmod u=rwx,g and o=rx
_U__ /_ G_ /_W_
r w x / r - x /r - x [site] chmod 755 Better for executable program
r w - / r - - /r - - [site] chmod 644 For customary file
r w - /- - - /- - - [site] chmod 600 Only for file thet run only you and yours script
U = user; G = group; W = world r = Read; w = Write; x = Execute; - = no permission
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