Group permissions are broken?

Dan Nelson dnelson at
Mon Aug 15 20:10:51 UTC 2011

In the last episode (Aug 15), Yuri said:
> User john is a member of both webcamd and vboxusers:
> # grep john /etc/group
> webcamd:*:145:john
> vboxusers:*:920:john
> When the file /tmp/my-test is owned by webcamd, user john can touch it ok:
> $ ls -l /tmp/my-test ; touch  /tmp/my-test
> -rw-rw----  1 vboxusers  vboxusers  0 Aug 15 12:54 /tmp/my-test
> But when /tmp/my-test is owned by webcamd, user john gets an error:
> $ ls -l /tmp/my-test ; touch  /tmp/my-test
> -rw-rw----  1 webcamd  webcamd  0 Aug 15 13:02 /tmp/my-test
> touch: /tmp/my-test: Permission denied
> Why does this error occur? Two groups seem identical. Just different group
> ids.
> Filesystem is UFS: /dev/ad10s1a on / (ufs, NFS exported, local)

As a sanity check, what is the output of the "groups" command?  If you
recently edited /etc/group, maybe you need to log out and back in to a
credential with the new group list?

	Dan Nelson
	dnelson at

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