There is a high order bit that tells if a file is actually a directory: d rwx rwx rwx. In that case:
The odd-looking chmod 755 name.class command sets the permissions. The permissions are encoded in binary, 111 101 101, then in octal 755, one bit for each permission, 1=ok 0=not ok to do that. 755 means I give myself permission to do everything, but I don’t let others write, though I let them read and execute.
|CHMOD Octal Permission Codes|
|+A||Set the archive attribute|
|-A||Clear the archive attribute|
|+H||Set the hidden attribute|
|-H||Clear the hidden attribute|
|+R||Set the read-only attribute|
|-R||Clear the read-only attribute|
|+S||Set the system attribute|
|-S||Clear the system attribute|
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