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I have accidently unlocked a system file with the command:

sudo chmod 777 /opt

Does anyone know how to undo this action or to lock it again?

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which system file? – user8290 Dec 26 '12 at 21:07
the /opt/ directory – Abood Mount Dec 26 '12 at 21:08
Thank you very much this worked. – Abood Mount Dec 26 '12 at 21:13
No problem. Can you mark it accepted please? (toggle the check) – user8290 Dec 26 '12 at 21:15
Did you just make this change to the /opt folder, or did you make it recursively so it affected the /opt folder and all its contents? If you don't know, please describe, with as much detail as possible, how you made the original change. – Eliah Kagan Dec 26 '12 at 21:45
up vote 2 down vote accepted

Ownership and permissions:

sudo chown root:root /opt; sudo chmod 0755 /opt
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