The number indicates that there was a group defined in /etc/group but is now
gone, you can check this behavior very easily.  Create a dummy group in
/etc/group and create a dummy file changing the  group to
the new  group, now remove the entry from /etc/group and do an ls -al
you'll see the number come up.

Ed

On Wed, 26 Jan 2000, you wrote:
> group
> 
> I just noticed something interesting, I have about 5000 users on an
> email server and some (about 300 of them) are not listed as being in the
> group that is the same as there user name, but the corresponding group
> is a 4 digit number such as 5710 and none of the numbers are repeated. 
> such as the example below....
> 
> drwx------ 2 twalsh   5713  1024 Oct 11  15:48 twalsh
> drwx------ 2 twyla    twyla 1024 Oct 11  15:49 twyla
> 
> 
> anyone have any clues as to the reason for the number in the group
> column???
> 
> (I will be looking for corresponding info in the password file)
> 
> 
> chris
> 
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