3 Replies Latest reply: Nov 19, 2012 10:50 PM by BDAqua
keraunoscopia Level 1 Level 1 (25 points)

Picture 1.png


Who is this mysterious "unknown" user? I can never change his (or her) Privileges. The icon, currently grayed out, is of a user behind a timepiece, a Lépine by the looks of it.


How can I get rid of him (or her) without actually defenestrating my laptop?

MacBook Pro 17", Mac OS X (10.5.8), 2.4 GHz 2GB
  • BobHarris Level 6 Level 6 (15,905 points)

    This means that the Group ownership field has a Group ID that is not contained in /etc/group, so the Finder just substitutes 'unknown'.


    There are 4 billion possible Group ID numbers, but only a handful are ever used.  Somehow you have stored a file on your system that is using a Group ID that does not contain a name in /etc/group


    For example, if you received a ZIP file (or any other container file) and unpacked it, it is possible that the Group ID from another system was used when creating the file on your Mac.


    You can use Applicaitons -> Utilities -> Terminal to change the group owner


    sudo chgrp staff "/path/to/the/file.name"


    Or you can just ignore this, as it is most likely harmless


    Message was edited by: BobHarris

  • keraunoscopia Level 1 Level 1 (25 points)

    Hmm, ok. So if I ignored it, it doesn't mean someone will be able to access my computer in the future—like some clever trojan or something? This "unknown" sometimes has the ability to read and read/write (iirc). I am unable to change it to No Access unfortunately.


    I don't understand the terminal line. What would the terminal line change the group owner to, and what is "file.name"?

  • BDAqua Level 10 Level 10 (120,910 points)

    I'm pretty sure you can ignore it... did you ever migrate thing from another user or OSX version to this Mac?