Glossary term
What is octal mode? Meaning for developers
The number form of permission bits such as 755, where read is 4, write is 2 and execute is 1 for each of owner, group and others.
Learn it properly · Linux & ShellLesson 1: Users, Permissions and OwnershipUsers and groups, reading rwx and octal modes, chmod and chown, sudo, umask, setuid in plain words, and common permission mistakes.