Fix a problem with Mac OS X 11 not being able to copy files

1. After upgrading Mac OS X 11, you want to copy files to the system directory.

sudo cp-f test.txt/usr/bin/

2、I found that even with permission sudo, there are also permission problems.

CP:/usr/bin/test:operation not permitted

3. The reason is that after upgrading Mac OS X 11, El Capitan has added the Rootless mechanism. It is no longer possible to edit any path at will, even if root permissions are set.

ps: Rootless mechanism is used to resist malicious programs.

4. Rootless mechanism needs to be disabled for the copy under bin directory.

5. Restart Press and hold Command + R to enter recovery mode.

6. Then open Terminal and enter: csrutil disable.

ps: When not needed, you can turn on csrutil enable again, after all, it is a protection mechanism.

This article comes from the "Going Upward Dream" blog, please keep this source http://mandyc.blog.51cto.com/1230448/1980146