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9.5 Fixing Permissions

Suppose you want to make sure that everyone can write to the directories in a certain directory tree. Here is a way to find directories lacking either user or group write permission (or both), and fix their permissions:

find . -type d -not -perm -ug=w | xargs chmod ug+w

You could also reverse the operations, if you want to make sure that directories do not have world write permission.