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I disabled SIP, but directory /usr/bin is write protected anyway. How to get write access for /usr/bin? Please don't suggest to switch to /usr/local/bin.
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This security feature is designed to make it even more difficult for malware to modify system processes, locations, and Kernel extensions. SIP prevents malware attacks from completion. Disabling it will instantly raise macOS vulnerability.
macOS Utilities In the Terminal, type in "csrutil disable" and press Enter. There should be a message that System Integrity Protection was successfully disabled.
I assume this answer might be relatively off-topic, as I'm not running the beta version of Catalina, but the official one.
In order to perform changes to /usr/bin, you'll have to perform the following steps.
/ as writeable.cmd + R while booting)Utilities -> Terminal in the top bar.# csrutil disable.# reboot)./ as writeableWith the OS in normal mode, start a new terminal session and execute the following:
$ sudo mount -uw /Please note that / will be mounted as read-only on the next system boot.
In order to enable SIP, the process is exactly the same as disabling it, except for the fact that you would have to run # csrutil enable.
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Catalina has a new file system arrangement where most of the system files are write-protected. Apple uses two partitions, a read-only one for the main system files and a writeable one for other files, and melds them together and presents them as one to the user.
For details see the WWDC video What's New in Apple Filesystems
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