Granting permission on files and directories is one of the crucial and data security stuff for Linux System Administrator. Permission on any file or directory is a combination of 9 alphabets. First 3 from the left represents owner access, then middle 3 represents user group access and the last 3 are for other users who are not the owner or part of a group having access. rwxrwxr wx We have several ways to grant permissions using the numeric and alphabetical method. Having knowledge of these shortcuts makes administrators life easy. rwx = 111 in binary = 7 rw- = 110 in binary = 6 r-x = 101 in binary = 5 r-- = 100 in binary = 4 So when you mention 765 numeric code to provide access permission, User will get like:- rwxrw-r-x