How to I use terminal to reset my core permissions?

Because of a bug in Adobe Flash Catalyst of not being able to export library files, I have taken the advice below of resetting my core privileges to read/write/execute for everyone. The command work perfectly for Flash Catalyst, but since it makes my computer more vulnerable, i think I better go back tothe default permissions. When I got in touch with Apple support, they weren't sure what command would reverse the sudo command I used. They suggested I reinstall Lion and restore from my Time Machine Backup. I'm wondering if there is a way to avoid doing this. This is the info that I followed:

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So this is to do with it wanting to write a file in / ( or c:\ ) for some reason. Probably should be using $TEMP (%TEMP)

anyway to fix on a mac OSX and decrease your security from any virus / stupid typo on a command line..

sudo chmod a+rwx /

or for those octal fan

sudo chmod 0777 /

This gives everyone write permision to the root directory which is not really an optimal solution I dont think adobe read this thread which is a shame as its a REAL bug.