Change Folder Permissions

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http://unix.stackexchange.com – I started off with changing to the folder I want to change permissions for, and that is the opt folder. $ cd /opt/ test@testVM:/opt$ So I tried changing the permissions for this folder now using: sudo chmod 775 And that hasn't worked. It showed this message: Try 'chmod --help' for more information. There is something I am forgetting or leaving out. Please can you show me what I am doing wrong? Thanks in advance. (HowTos)