obscure Unix find command syntax understanding

问题

Need help in understanding this complex Unix find command and its operation:

find . \( \! -user xx -exec chown -- xx '{}' + -false \) -o    \
\( \! -group root -exec chgrp -- root '{}' + \) -o \
\( ! -perm 700 -exec chmod -- 700 '{}' + -exec false \; \)

Also, I am looking out in particular the purpose of -false predicate. I guess I mixed both GNU and non-GNU find syntax

回答1:

The false predicate evaluated to false for -o and it is used here to prevent short short-circuiting.

• if user is not xx make it xx
• if group is not root, make it root
• if not all permissions are set for the owner, grant all permissions.

Each command is separated by -o and terminated by false so that they are ALL applied to each item.

来源：https://stackoverflow.com/questions/21525727/obscure-unix-find-command-syntax-understanding