After I set the permission to have both groups added to different user I am still not able to change the permission for directory and files.

id adminOne
uid=495(adminOne) gid=492(apps) groups=492(apps),5002(shared)

id adminTwo
uid=7376(adminTwo) gid=5002(shared) groups=5002(shared),492(apps)

If I log in with adminOne I changed a shared folder such as test...

adminOne@UnixEB: chmod -R 777 test
chmod: changing permissions of `test': Operation not permitted

adminOne@UnixEB: ll
drwxrwx--- 7 adminTwo shared 4096 Nov 30 11:40 test

why I cannot change the permission when I already set the owner to both groups?

  • May be the folder has some extended attributes set? – Inian Nov 30 '17 at 18:02
  • what do you mean by extended attribute set? – logger Nov 30 '17 at 18:03
  • ACLs. Immutability. Read-only filesystem. There are many possibilities. – DopeGhoti Nov 30 '17 at 18:04
  • Is SELinux enabled? What is the output of getenforce? – Abhik Bose Nov 30 '17 at 18:08
  • 1
    With traditional (non-ACL) access rights, only the owner can change the permissions of a file. – Andy Dalton Nov 30 '17 at 18:10

I mentioned this in a comment above, but it's worth calling out again. Having write permissions does not give a non-owner the right to modify the permissions of a file – only the owner (or root) can change a file's permissions.

You may be able to use ACLs to enable what you're after; see: https://unix.stackexchange.com/a/75915/90691

| improve this answer | |
  • 1
    That's about "Richacls" in particular, not POSIX ACL:s. It seems that Richacls was included in OpenSUSE, but removed some years ago. And judging from this post from April 2017, it's still not in mainline Linux either – ilkkachu Nov 30 '17 at 22:07
  • Yeah, that's why I qualified the comment with "may be able to". I'd never heard of Richacls, I was just referencing the related discussion. – Andy Dalton Nov 30 '17 at 22:31

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