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Ran:

unlink /usr/lib/libz.1.dylib

Now I can't launch from my user profile.

I have been able to run in recovery mode, where I can see the .dylib in question is there, but running in single-user mode I get the error:

dyld: Library not loaded: /usr/lib/libz.1.dylib

Reason: image not found

And, if I cd into lib, and type 'ls' libz.1.dylib isn't listed there.

Help please! (I'm out of my depth)

Thanks

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1 Answer 1

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The recovery partition is completely separate from the main OS partition. I'm running 10.15 not 10.12, but the approach will be similar if not identical:

hdiutil attach /Volumes/Recovery/*/BaseSystem.dmg
cp '/Volumes/macOS Base System/usr/lib/libz.1.dylib' /usr/lib/
diskutil unmount '/Volumes/macOS Base System'

The first line mounts the recovery partition so you can access it. It'll tell you what it mounted as, for me it was /Volumes/macOS Base System. Then you can copy the file from there to the main OS partition. The third line then unmounts the recovery image

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