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Cheers! It worked wonderfully :)

Yes, the thing is I need to use the sudo as follow:

RosBook:~ ro$ sudo chmod 777 /usr/bin
-bash: sudo: command not found

But sudo is not found given that I don't have neither read permission...

I accidentally changed to sudo chmod a=w to my /usr/bin folder on my macbook with OS 10.5.8... Please help! I can't even get into a terminal correctly cause it displays:

-bash: uname: command not...