HDTenEightyP/NetNews huggingface dataset:
From: gary@sci34hub.sci.com (Gary Heston)
Subject: Re: Xterminal-Server ratio wanted
Reply-To: gary@sci34hub.sci.com (Gary Heston)
Organization: SCI Systems, Inc., Huntsville, Al.
Date: Tue, 29 Sep 1992 16:52:18 GMT

In article <1992Sep28.225626.15772@odin.corp.sgi.com> mikey@sgi.com writes:
=In article <BuoGGA.ACp@solbourne.com>, cy@solbourne.com (Cy Foughty) writes:
=|> >Hmmm. We have a lot of satisfied customers using HP 9000/7xx hosts and 700/RX
=|> >terminals. Solbourne wouldn't happen to make SYMMETRIC MULTIPROCESSOR SERVERS,
=|> >would they :-) ?
=|> Why I think they do! ;->
=
=I think SYMMETRIC MULTIPROCESSOR SERVERS are a good idea, too.  :-)
=
=|> >I keep seeing "SYMMETRIC MULTIPROCESSOR SERVERS" (all caps); is this some sort 
=|> >of registered trademark of Solbourne Computers :-) ?
=|> Hey, what a great idea! ;-)
=
=Sorry, but Solbourne can't claim such things all for themselves..

I volunteer to do an extended burn-in test and evaluation of any
Unix-based SYMMETRIC MULTIPROCESSOR SERVERS that Solbourne or SGI 
wish to provide. Think 5 years would be long enough?


-- 

Gary Heston    SCI Systems, Inc.  gary@sci34hub.sci.com   site admin
The Chairman of the Board and the CFO speak for SCI. I'm neither.
"...I looked out my window, and saw Kyle Pettys' car upside down, then I
From: fwp@CC.MsState.Edu (Frank Peters)
Newsgroups: comp.unix.admin
Subject: Re: temparary superuser
Date: 3 Oct 92 21:21:47 GMT
Distribution: usa
Organization: Computing Center, Mississippi State University

In article <1992Oct2.230122.24463@RedBrick.COM> mmt@RedBrick.COM (Maxime Taksar) says:
: 
: A well set-up, well maintained system shouldn't have any problems
: with casual experimentation.  If it *does*, then average users
: shouldn't be allowed on it.

That is a nice dream but must people know that reality usually falls a
bit short of that.  It is a tenet of security discussions that the only
way to make a system truely secure is to turn it off and lock it in a
room (most people, actually, maintain that this is insufficient).

No matter how much work I do to make my system secure I can never
*know* that there are no more holes left.  In that environment users
poking at my systems with the obvious intent of getting root access
attract my attention and find me to be less than friendly.

Similarly (I love analogies, don't you?) I would not like random people
trying my door knob no matter how solid my locks are.

: Computers are tools and not sacred objects.  Users shouldn't be
: trained to be afraid of them.

No, they shouldn't.  But there is a difference between experimenting
with user commands and experimenting with ways to gain root access
without the permission of the system's administrator.
--
Frank Peters  -  UNIX Systems Programmer  -  Mississippi State University
Internet: fwp@CC.MsState.Edu  -  Phone: (601)325-7030  -  FAX: (601)325-8921
Newsgroups: comp.unix.admin,comp.unix.sysv386,comp.sys.att
From: murphyn@rtsg.mot.com (Neal P. Murphy)
Subject: Re: Postscript printer question
Organization: Motorola Inc., Cellular Infrastructure Group
Distribution: na
Date: Wed, 30 Sep 1992 20:53:10 GMT

>In article <1992Sep21.185057.4923@utagraph.uta.edu> measures@cse.uta.edu (Mark Measures) writes:
>>appears that something is not quite right with the prologue code.
>>I get the following:
>>
>>% %!PS-Adobe-

If that is what you see from the printer, then the first two bytes of the 
print file are wrong. For the spooler to recognize a file as containing
PostScript code, the first two bytes *must be* "%!". It would appear that
the first two bytes of your file are "% ", which is 'bad magic' as far as
the print spooler is concerned.

NPN
Newsgroups: comp.unix.admin
From: cfwpm@ux1.cts.eiu.edu (Bill McGown)
Subject: crontab disabled?
Date: Thu, 01 Oct 1992 20:34:53 GMT
Organization: Eastern Illinois University

On one system here at EIU crontab has been "restricted" so that
it is not available to regular users. The reason given is that
it has the potential to interfere with backups. Is this a real
concern (i.e., can it do so)? If it can screwup backups is there
some fix/patch/kludge that can avoid the problem?

Many Thanks for the help.

Bill.

-- 
**************************************************************
W. P. (Bill) McGown                     Eastern Ill. Univ
cfwpm@ux1.cts.eiu.edu                   Psychology Department
                                        Charleston, Il. 61920
Newsgroups: comp.unix.admin
From: plarkin@iphase.iphase.com (Patrick Larkin)
Subject: Re: Help wanted
Organization: Interphase Corp.
Date: Fri, 25 Sep 1992 14:03:31 GMT


In article <00960CCD.48F2D060@vms.csd.mu.edu>, 5247cuid@vms.csd.mu.edu writes:
|> Dear netters:
|> 
|> 	I have questions regarding sun. How are the directory entries
|> formatted on the sun? Sometimes, some system directories are listed with
|> '@' following their names.AFor example, adm@, X@ etc. What does that mean?
|> and how is it implemented

If you type 'which ls' you will probably see that it is really something like:
/bin/ls -F
The -F option puts a special symbol after certain types of files
(*=Executable, /=directory, @=symbolic link)
Therefore what looks like 'adm@' is really just 'adm'.   If you'll type
'ls -l', you will see that 'adm' is actually in '../var/adm' as below:
lrwxrwxrwx  1 root           10 Nov  5  1991 adm -> ../var/adm
If you're not familiar with Symbolic Links, try this. cd to /usr, do a pwd, then
cd to adm, the pwd again..... make any sense?
-- 
_________________________________________________________________________
   Patrick H. Larkin, Jr.                     Interphase Corp.      
    System Administrator                       13800 Senlac 
                                               Dallas, TX 75234-8823 
     plarkin@iphase.com          /The opinions expressed are mine alone \
                                 \and do not reflect those of Interphase/
-------------------------------------------------------------------------
-- 
_________________________________________________________________________
   Patrick H. Larkin, Jr.                     Interphase Corp.      
    System Administrator                       13800 Senlac 
                                               Dallas, TX 75234-8823
From: pascoe@rocky.gte.com (Dave Pascoe)
Newsgroups: comp.unix.admin
Subject: Re: Invalid field in /etc/passwd
Date: 5 Oct 92 16:17:55 GMT
Article-I.D.: europa.1992Oct5.161755.9531
Organization: GTE/MSED - Needham Heights, MA
X-Newsreader: TIN [version 1.1 PL6]

I (pascoe@rocky.gte.com) wrote:
: I can't seem to find what's wrong in /etc/passwd but whenever a user
: changes his password I get the following error message on console:
: 
: Oct  5 09:33:34 rocky passwd[23079]: invalid name field:  "
: 
: I looked through all the name fields and can't find anything odd.  I'm
: sure it's something that isn't visible.  What are the rules for the
: name field?  How can I fix this problem easily?

Thanks to those who responded....this turned out to be a blank line
right at the end of /etc/passwd.  Once I got rid of the blank line
everything was fine.
Newsgroups: comp.unix.admin
From: misch@rbhp90.rbg.informatik.th-darmstadt.de (Clemens Misch)
Subject: Re: Help with lost file (PLEASE)
Date: Fri, 2 Oct 1992 10:07:44 GMT
Reply-To: misch@rbhp90.rbg.informatik.th-darmstadt.de
Organization: Rechnerbetriebsgruppe FB20; TH Darmstadt (Germany)


In article <388@rehab1.UUCP>, dans@rehab1.UUCP (Dan Schein) writes:
> In article <1992Sep25.150251.14331@openage.openage.com> gryphon@openage.openage.com (The Golden Gryphon) writes:

[ snip ]
> *Tsk. Tsk.  When you remove a file in UNIX you put the inodes back on the
> *free list.  Since the free list is a stack, the next file that was created 
> *used those inodes.  Sorry.  
> *
> *What you needed was a program called Butt Saver by Cactus International.
> *This is a program that will retreive removed files off the free list.
> *
> 
>   Ive wondered about that program for some time now. Since the last inodes
>  in (free) are the first out (used), how much use would a program like Butt
>  Saver really be? Considering Un*x is a multitasking, multiuser system.
> 
>   Anyone have any actual experience with it?

Being a curious one, I checked the behaviour of 'rm' on our HP 9000/400
with HPUX. After removing a file I inspected the inode with 'fsdb' and
discoverd that even the pointers to the datablock were zeroed. Also
(with the long filesystem on HPUX) the inode-number in the directory
is zeroed. So, if you want to reconstruct a file on HPUX you are
pretty stuck. I don't want to sift through megabytes of data to
collect all blocks belonging to my files.
--
===============================================================================
Clemens Misch                                        Rechnerbetriebsgruppe FB20
                                                     Merckstrasse 25 
EMail: misch@rbhp90.rbg.informatik.th-darmstadt.de   W6100 Darmstadt (Germany)
Tel.: +49 6151 163514
===============================================================================
From: barr@pop.psu.edu (David Barr)
Newsgroups: comp.unix.admin
Subject: Re: Can't resolv host localhost
Date: 1 Oct 92 20:33:06 GMT
Distribution: na
Organization: Penn State Population Research Institute


	How about just putting the line:

localhost       in      a       127.1

in your DNS configuration?

--Dave
-- 
System Administrator, Population Research Institute    barr@pop.psu.edu
  Contains: Carbonated water, high fructose corn syrup and/or sugar, caramel 
  color, phosphoric acid, caffeine, citric acid and natural flavorings.
Newsgroups: comp.unix.admin
From: drl@vuse.vanderbilt.edu (David R. Linn)
Subject: Re: No Directory! Go away!
Organization: Vanderbilt University School of Engineering, Nashville, TN, USA
Date: Mon, 28 Sep 1992 18:41:29 GMT

In article <BvAryx.24z@mtholyoke.edu> jbotz@mtholyoke.edu (Jurgen Botz) writes:
>{paragraph saying CS is a subdomain of his IS NIS domain]
>
>Now what I'd like to do it prevent people without home directories
>from loggin in entirely.  A couple of simple hacks come to mind...
>i.e. have .cshrc and .login files in the root that log people off
>immediately if they're not root, but none of them seem particularly
>secure.  Anybody know of a good way of doing this?

Create a CS netgroup (mine is called cs-users) and have these two lines
in your password files after the local accounts:

+@cs-users::0:0:::
+::0:0:::/You-are-not-authorized-to-use-this-machine
-- 
David R. Linn, System/Mail/News Manager	| INET: drl@vuse.vanderbilt.edu
Disclaimer: I speak only for myself	| Phone: [+1] 615-343-6164
      "Some do, some don't and that's the way of the world."
From: sherwood@fenris.space.ualberta.ca (Sherwood Botsford)
Newsgroups: comp.unix.admin
Subject: Password generation Samples
Date: 2 Oct 92 17:23:22 GMT
Article-I.D.: kakwa.1992Oct2.172322.6190
Organization: University Of Alberta, Edmonton Canada

Oh, I forgot:  So you aren't asking for a pig in a poke,  
this is typical stuff churned out by this password travesty  
generator:

Samples:
fulycuru 
mpenckne
abfateec
hoomomys
ertrarit
egasplak
yweaissw
efimaste
alelenib
lfoomery
llousspo
licoloni
oweptone
seruxeon
fapierou
tinddind
ondiloxh
indrmint
ebentaxo
riutycoi
memopsua
griousko
oycichar
leseedjo
trceaben
daittenn
vearmoua
malenint
ylicotor
erogigyw
dootcach
estelypu
cralabun
singlant
haroledp
letupand
ewdenqun
nglaratu
sineeuio
nangayar
omerount
itopemen
veatcabl
lerntolf
enosting
randaspo
ntonkath
enymmizy
lfindicu
ldydampi
erampsin
ttebusho
larigada
nearreea
ntronytr
emexthin
ityoumpr
iveladun
earusero
ngeerfal
innteran
adifffub
ininttef
iteercon
ilaleceu
From: nelson@reed.edu (Nelson Minar)
Newsgroups: comp.unix.admin
Subject: Replacement for utmp system?
Date: 5 Oct 92 19:09:57 GMT
Reply-To: nelson@reed.edu (Nelson Minar)
Organization: Reed College, Portland, OR

I'm going crazy with UNIX's utmp system. It's just not very useful in
most UNIX installations today, where you have 15 workstations and 12 X
terminals and one sort of central computer but not really. 

I want to be able to know *which* machines people are logged into -
preferrably a list of all allocated ttys.

I also want to know if a human is on the UNIX network, and if so how
to send her messages.

These are very independent tasks, and /etc/utmp just doesn't work out
very well (X terminals are a particularly bad problem)

Are there any replacement systems? I'm aware of athena.mit.edu's
zephyr, and it seems to fulfill the second requirement, but I don't
think it is publically available.

Is it feasible to install something like this without source for your
telnetd, rlogind, login, etc? (I think yes, but it's a gross hack.)
                __
nelson@reed.edu \/   Delicious & Nutritious breakfast cereals shot from guns!
Xref: sparky comp.unix.admin:5417 comp.unix.ultrix:7397
From: imtst@pitt.edu (I-ming Tsai)
Newsgroups: comp.unix.admin,comp.unix.ultrix
Subject: How to stop savecore after a crash dump.
Date: 7 Oct 92 01:59:04 GMT
Followup-To: comp.unix.admin
Organization: University of Pittsburgh
Originator: imtst@unix.cis.pitt.edu


When a unix machine boots, how does he know there is a crash dump
exists and savecore to vmunix.n and vmcore.n ?

We have a DEC 5000/240 running Ultrix 4.2a. It turns to be that
even I removed the dump file (vmunix.n and vmcore.n), the machine
still savecore EACH TIME when he reboots.  And when I removed
everything under /usr/adm/crash (including bounds), he showed
the following message when he tried to savecore.

" Savecore: checking fro dump ... partial dump exists.
  System went down at (.... some time ....)
  Dump time is unreasonable.
  Crash time or space problem "

How do I stop the savecore ? Thank you in advance !

-- Ming
From: mike@pacsoft.com (Mike Stefanik)
Newsgroups: comp.unix.admin
Subject: Re: temparary superuser
Date: 29 Sep 92 13:23:14 GMT
Distribution: usa
Organization: Pacific Software Group, Riverside, CA

In an article, helho@ecst.csuchico.edu (Weird!!) writes:
>I am not a sys sdmin in my school. I just wanna learn more about Unix [...]
>Is there any way I could do such that I can become a root?
>                                               
>                                                 Unix novice
>                                                 Ken

C'mon... this is a joke, right? ;-)
-- 
Mike Stefanik  mike@pacsoft.com  ...!uunet!pacsoft!mike  (714) 681-2623
Pacific Software Group, Riverside, CA
Xref: sparky comp.unix.admin:5321 alt.folklore.urban:24606
From: dbell@cup.portal.com (David J Bell)
Newsgroups: comp.unix.admin,alt.folklore.urban
Subject: Re: Floppy Disk Labels
Date: Wed, 30 Sep 92 20:34:17 PDT
Organization: The Portal System (TM)
Distribution: world
  <1405@pacsoft.com><BvAA2J.25v@calvin.demon.co.uk>
  <id.C1OT.EV5@ferranti.com> <TRIF.92Sep30151618@bike.rad.washington.edu>

   In article <BvAA2J.25v@calvin.demon.co.uk> barrie@calvin.demon.co.uk (Barrie
 Spence) writes:
   > Another, just as bad - A customer (DOS/PC) couldn't restore files from
   > backup floppies after a disk crash - he/she had used a magnet to stick
   > them against a convenient pipe/conduit next to the desk.

   Can you provide information about when and where this happened? Did you
   personally observe this? I'd like to find out if this has more than urban
   legend status...

Aint no thang....   I have *long* kept a 5 1/4 floppy in the paper
envelope "nailed" to my filing cabinet with quite a powerful ceramic
magnet, and a label saying "SAVE!! DOS Boot Disk". 

It naturally stirs up anyone who first sees it:

1) Disbelief - "That isn't really a magnet, is it?"
		I take it down and show them the magnet.

2) Denial -    "That isn't REALLY your backup boot disk!"
		I boot with the disk.

3) Suspicion - "You must have Mu-metal in the envelope!"
		I show them the (empty) envelope.

4) Consternation...


*Sometimes* I give them the spoiler!


































The field strength at the perimeter of the diskette, where the boot
tracks are, is way below the threshold of danger to the data.

Now, if the diskette were fairly *full*, the data in the inner tracks
would be ruined.

Then there was my friend who, once he had been shown the trick,
delighted in dropping by and vigorously rubbing the magnet ALL OVER
the diskette, then putting it back up and walking out of the office...

Dave
dbell@cup.portal.com
Newsgroups: comp.unix.admin,comp.windows.x
From: cy@solbourne.com (Cy Foughty)
Subject: Re: Xterminal-Server ratio wanted
Organization: Solbourne Computer, Inc., Longmont, CO
Date: Tue, 29 Sep 1992 00:27:07 GMT

In article <1992Sep28.225626.15772@odin.corp.sgi.com> mikey@sgi.com writes:
Stuff deleted...
>|> >I keep seeing "SYMMETRIC MULTIPROCESSOR SERVERS" (all caps); is this some sort 
>|> >of registered trademark of Solbourne Computers :-) ?
>|> Hey, what a great idea! ;-)
>
>Sorry, but Solbourne can't claim such things all for themselves..
It was just a joke. Don't take it serious.

>
>-----------------------------------------------------------------------
>                 Mike Yang        Silicon Graphics, Inc.
>               mikey@sgi.com           415/390-1786


-- 
        Cy Foughty                
	ARETC: Association for the Revival of Electron Tube Computing
From: flynn@Chaos.mcs.kent.edu (Mark Flynn)
Subject: Re: tar all but one directory
Organization: Kent State University
Date: Tue, 29 Sep 1992 21:04:15 GMT


>In article <1992Sep23.215323.15172@adx.adelphi.edu>, nancy@adx.adelphi.edu (Nancy Lee) writes:
>- 
>- 	Is there any way that one can use tar to back up everything
>- under a directory but a sub-directory of it. Thanks in advance.
>

The X (upper case) option is used to indicate a file containing files to be
excluded. I ran into this on a SUN. Unfortunately, sun's tar is brain dead,
so I got gnutar, whihc works fine (so far).

Mark Flynn
From: dulfer@rnzll3.uucp (Cees Dulfer)
Newsgroups: comp.unix.admin
Subject: Application Packaging Tools
Keywords: packaging
Date: 5 Oct 92 10:21:02 GMT
Followup-To: dulfer@rabo.nl
Organization: RABO bank Nederland, Zeist

We are using the Application Packaging Tools (pkgmk,pkgadd,pkgrm)
on an Olivetti LSX 5000, runing SV, release 4.0.
The documentation supplied by the vendor only contains basic
information, which doesn't fullfill our needs. For instance:
"instances" are mentioned, but nowhere is stated how they should
be created and handled.

Does anybody know which functionality is offerred by these tools
and how it can be applied, where we can attend courses on an expert
level and where we can get detailed information (or even spec's).
Newsgroups: comp.unix.admin
From: barrie@calvin.demon.co.uk (Barrie Spence)
Subject: Re: Floppy Disk Labels
Organization: DataCAD Ltd, Hamilton, Scotland
Date: Mon, 28 Sep 1992 10:20:41 GMT

In article <1405@pacsoft.com> mike@pacsoft.com (Mike Stefanik) writes:
>In an article, dnichols@ceilidh.beartrack.com (Don Nichols (DoN.)) writes:
>>If someone just put a staple in the middle of the label, it would
>>probably go through the diskette itself, making it hard to turn :-) [...]
>
>All of this makes me think of something a friend of mine who used to be
>in the field service biz told me: A customer was having a problem with
>their floppy drive ... it seems that it couldn't read or write any floppies
>that she used. A tech was sent out and tested the drive.  Everything was
>fine, but he replaced the drive anyway. A few days later, she called again
>saying that this drive didn't work either. Once more, a field tech checked
>the drive and everything was fine (and they replaced it one more time).
>Yes, a day later she called again, complaining that these techs obviously
>didn't know what they were doing because the floppy drive just did not
>work. Yet another field tech was sent out to replace the drive. After it was
>installed, he asked her to try the drive (instead of testing it himself).
>Commenting that she wanted to label the floppy before using it, she produced
>a label, put it on the disk and inserted the disk in her typewriter ...


Another, just as bad - A customer (DOS/PC) couldn't restore files from
backup floppies after a disk crash - he/she had used a magnet to stick
them against a convenient pipe/conduit next to the desk.

I suppose somebody somewhere must have used drawing pins...


-- 
Barrie Spence                      DataCAD Ltd, Caird Street
barrie@calvin.demon.co.uk          Hamilton, Lanarkshire ML3 0AL, Scotland
	Telephone +44 (0) 698 425599 / Fax +44 (0) 698 419173
From: kevin@sherman.pas.rochester.edu (kevin mcfadden)
Newsgroups: comp.unix.admin
Subject: Getting mail regardless of which workstation... using nfs
Date: 29 Sep 92 16:10:09 GMT
Distribution: na
Organization: University of Rochester

I am wondering if there is a script that will allow a user to read mail 
even if the user is not logged into the workstation that is the mail host.
We are running a network of 6 sparc stations and 2 sun3s using nfs.

Thanks,

kevin@sherman.pas.rochester.edu
Newsgroups: comp.unix.admin
From: djiracek@thunder(Dan Jiracek)
Subject: Want more info on mail reflectors
Reply-To: djiracek@fnbc.com
Organization: First National Bank Of Chicago, Chicago IL, USA
Date: Wed, 30 Sep 92 11:54:20 GMT

I am reading a very good book about the Internet called The Whole Internet  
- User's Guide & Catalog and the author touched on the subject of mail  
reflectors. These reflectors are used to broadcast mail to a list of  
subscribers.

Does anyone know how to set this up or where there is documentation on  
this?
  

--
Daniel Jiracek			(312) 732-1421
Network Specialist		Dan_Jiracek@fnbc.com
First Chicago Bank		NeXT Mail Accepted
Newsgroups: comp.unix.admin
From: vulture@carrion.cc.ic.ac.uk (Thomas Sippel - Dau)
Subject: Re: No Directory! Logging in with HOME=/
Reply-To: cmaae47@cc.ic.ac.uk
Organization: Imperial College of Science, Technology and Medicine
Date: Mon, 28 Sep 92 12:23:22 BST

In article <1992Sep25.000434.23008@citec.oz.au>, sgccpxb@citec.oz.au (Paul Brown 2245719) writes:
- 
- We have a database machine that users don't need a home directory for.
- Because it has the same passwd file as other machines, that require you 
- to have a home directory, we can't just edit out the field in passwd.

If you run NIS, use the +::0:0::/one-home-fits-all:/bin/one-shell-fits-all
at the end of the passwd file facility of NIS.

If you do not run NIS, how do you propagate user's password changes to all
machines ? Edit the passwd entry when you machine acquires it.

                                     Thomas

-- 
*** This is the operative statement, all previous statements are inoperative.
*   email: cmaae47 @ cc.ic.ac.uk (Thomas Sippel - Dau) (uk.ac.ic.cc on Janet)
*   voice: +44 71 589 5111 x4937 or 4934 (day), or +44 71 823 9497 (fax)
*   snail: Imperial College of Science, Technology and Medicine
*   The Center for Computing Services, Kensington SW7 2BX, Great Britain
Newsgroups: comp.unix.admin
From: vulture@carrion.cc.ic.ac.uk (Thomas Sippel - Dau)
Subject: Re: Can't resolv host localhost
Reply-To: cmaae47@cc.ic.ac.uk
Organization: Imperial College of Science, Technology and Medicine
Distribution: na
Date: Thu, 1 Oct 92 10:10:55 BST

In article <9209302008.AA00645@hrt213.brooks.af.mil.brooks.af.mil>, tjm@hrt213.brooks.af.mil (Tim Miller) writes:
-
- 	Of course, should you wish to avoid yp altogether and still use
- /etc/hosts, you'll have to write your own resolving routines and add
- them to libc as you did before.

or add the following line to the resolv.conf file:

      hostresorder    local   bind

                                                Thomas
-- 
*** This is the operative statement, all previous statements are inoperative.
*   email: cmaae47 @ cc.ic.ac.uk (Thomas Sippel - Dau) (uk.ac.ic.cc on Janet)
*   voice: +44 71 589 5111 x4937 or 4934 (day), or +44 71 823 9497 (fax)
*   snail: Imperial College of Science, Technology and Medicine
*   The Center for Computing Services, Kensington SW7 2BX, Great Britain
Newsgroups: comp.unix.admin,alt.folklore.urban