Shulou(Shulou.com)06/03 Report--

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

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

2. It is found that there is a permission problem even if the permission sudo is used.

Cp: / usr/bin/test: Operation not permitted

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

The ps:Rootless mechanism is used to resist malicious programs.

4. For copies under the bin directory, the Rootless mechanism needs to be turned off.

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

6. Then open Terminal and type: csrutil disable.

Ps: when you don't need it, you can turn it on again by csrutil enable. After all, it's a protection mechanism.

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