ln: /usr/bin/mysql: Operation not permitted

Question

After I install the mysql in my Macbook Pro, when I excute the order:

$ sudo ln -s /usr/local/mysql/bin/mysql /usr/bin

I get a error:

Password:
ln: /usr/bin/mysql: Operation not permitted

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I have tried the method below:

Method 1:

1) vim ~/.bash_profile
2) add export PATH=$PATH:/usr/local/mysql/bin

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3) source ~/.bash_profile

Answer 1

You get this error message because of Apple's System Integrity Protection. System Integrity Protection includes protection for these parts of the system:

/System
/usr
/bin
/sbin
Apps that are pre-installed with OS X

Paths and apps that third-party apps and installers can continue to write to include:

/Applications
/Library
/usr/local

This means that you can simply create a symbolic link in /usr/local/bin (it's still in your $PATH), but not in /usr/bin.

Also, you can disable System Integrity Protection (I strictly advise against that) by:

1. Click the  menu.
2. Select Restart...
3. Hold down command-R to boot into the Recovery System.
4. Click the Utilities menu and select Terminal.
5. Type csrutil disable and press return.
6. Close the Terminal app.
7. Click the  menu and select Restart....