mach_kernel document appeared

thank you so much kurt for saving me! i really appreciate your help and feedback. i did what you said: put the mach file back on the root drive authenticated and repaired permissions. everything seems to be working normally, but i still can't hide the mach_kernel file. i've unhidden everything again and it still shows up there hidden or not. i have noticed the files that are normally hidden are greyed out, but the mach_kernel file is not greyed out. i'm guessing that's why it's not hidden when i hide the files. ??? i tried sabatica's trick again, but to no avail. it will not hide. i even tried restarting my computer and still the same. i guess i should just leave it alone and let it remain visible? thanks in advance for the advice!

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A bug in the 10.8.5 update changed a flag on the kernel file. Enter this in Terminal:

sudo chflags hidden /mach_kernel

It will then ask for your admin password to complete the command. After that, the kernel should be hidden.

Mine is visible as well since the supplemental update (though I didn't notice since I set finder to show hidden files/folders). Just changed the flags. Odd.

Just submitted a bug report.

Message was edited by: nbar

Do you really have to repair permissions and all that stuff? I just hid it with 1 line as per Thomas. It's an admin file anyway, if I recall its permissions.

Works on mine! 10.8.5 MBPR Thanx a bunch!!!

This never happened before and I was gonna delete it. The system asked for a password and I thought I should have googled this before anything unreversable happened.

Thanx! Thamas

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Do you really have to repair permissions and all that stuff?

Not if you didn't move the file, as tigger07 did when he put it in the trash. As soon as he did that (and needed to enter his admin password to move the file), the file ownership permissions would have been changed to 501 (the user), rather than 0 (the OS).

thx

Thank you for sharing this. I too saw the file appear as soon as updating to 10.8.5. This came along with a host of other serious issues including external drives being randomly disconnected with out being "properly ejected."

I just noticed this file today. Since it said kernel I said I better google it. Trying to hide the file through usual means didnt work for me. The only thing that worked was the sudo command mentioned above by Kurt. Thanks for the tip.

I also have the mach_kernel file showing in my Macintosh HD folder, in between Library and System.

But presumably Apple will correct the error in showing this normally hidden file in their next update?

Just thinking best if I don't do anything, unless it's in the wrong place.

Sarah

It's actually a very simple error. Apple updated the kernel, but the script didn't set the hidden flag back on. Since it's not set as a hidden file, it will stay visible even if the system is correctly set to hide invisible items.

All you have to do is run the command I noted above to reset the flag where it should be.

You can leave it if you want. It doesn't hurt or change anything for it to be visible. You just have to remember to leave it alone.

Same issue here, to the date as well. I also noticed an "installer log file."

I chimed in here because after tossing the mach_kernel file, I googled simply to find out why it appeared in my hard drive after the 10.8.5 update in the first place. I was led to this discussion and after reading these posts, I have no clue what you guys are going on about. My mach_kernal file was tossed without issue whatsoever. 48 hours later my mac works as always. I tested every little thing after reading your posts... no problems. Did I miss something?