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I'm running the macOS beta for Catalina (10.15) and I'm trying to find out how to create a firm link. (Not a hard link, soft link, alias or anything like that.) The WWDC keynote mentions a new feature referred to as firm links but I can't seem to find out how to do it...

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The answer is: you cannot [at least not yet on Betas]

From Apple's official Q/A

Question: Can firmlinks be created by endusers, or are they reserved to the system? If they can be created by the enduser, what commands are used to create them?

Answer: No, firmlinks can't be created by endusers. This is reserved currently to the system. There will be synthetic firmlinks coming, which can be used as mount points for network resources.

Question: If firmlinks can be created by endusers, is there any advantage to using firmlinks over using Unix symlinks?

Answer: Firmlinks can't be created by endusers. Symlinks will be more flexible because they are path-based and able to point to that path regardless of volume ID changes. Firmlinks will be referring to a particular volume.

reference: https://forums.developer.apple.com/thread/117521

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    Well, now that Catalina is out it would be /great/ if they explained how to do synthetic firmlinks since otherwise you can't have folders on the root of the drive. :-/ – Jordan Oct 8 '19 at 2:40
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    @Jordan Try man synthetic.conf – steshaw Oct 9 '19 at 4:59
  • @steshaw Thanks, you save my life. @Jordan for example echo -e "data\t/Volumes/HDD" | sudo tee -a /etc/synthetic.conf note that each line should be separated by a tab character, space can not work. – Elf Sundae Oct 9 '19 at 17:33

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