Change Folder Permissions in SCO

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http://unix.stackexchange.com – I am learning Linux for work, so am still a bit rusty on the edges. I am needing to change the folder permission of folder /opt, and I know in Linux, you do the following: chmod 775 /opt I get a message under that saying: chmod: WARNING: cannot change /opt/: Operation not permitted (error 1). Does that mean I need SUDO permissions? But the SUDO command is not recognized. But in SCO, it is different, as SCO is a little older than Ubuntu. I have found this link on the net, but don't quite understand what they mean by "memo": http://osr507doc.sco.com/en/OSUserG/_Changing_file_permissions (HowTos)