[olug] Unix Tip: GET YOUR IP-ADDRESS (long explanation)

[CM Miller]

In reference to today's UNIX tip....



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			      UNIX GURU UNIVERSE 
			         UNIX HOT TIP

			Unix Tip 1905 - March 20, 2003
		    

Type this simple command at the unix-prompt

ifconfig | grep "inet addr" |  grep -v "127.0.0.1" |
awk '{print 
$2;}' |  awk -F':' '{print $2;}'





--- "Blaufuss, Shane" <sblaufuss at fnni.com> wrote:
> Nobody said anything about a command line :)
> 
> > -----Original Message-----
> > From: CM Miller [mailto:cmmiller1973 at yahoo.com]
> > Sent: Thursday, March 20, 2003 2:23 PM
> > To: Omaha Linux User Group
> > Subject: Re: [olug] Unix Tip: GET YOUR IP-ADDRESS
> (long explanation)
> > 
> > 
> > 
> > I know what all of these commands mean, but why do
> > something like this at the command line?  A
> script,
> > yes. 
> > 
> > -Chris 
> > 
> > --- Eric Penne <epenne at olug.org> wrote:
> > > ifconfig | grep "inet addr" |  grep -v
> "127.0.0.1" |
> > > awk '{print $2;}' |
> > > awk -F':' '{print $2;}'
> > > 
> > > 
> > > Here is a rundown on this command for the
> newbies.
> > > 
> > > 1) ifconfig is usually located in /sbin/ifconfig
> > > shows the network
> > > interfaces that are up and how they are
> configured.
> > > 
> > > 2) grep pulls lines out of the ifconfig info
> that
> > > contain inet addr
> > > 
> > > 3) grep -v inverts.  It prints all the lines
> that
> > > don't have 127.0.0.1
> > > in them.
> > > 
> > > 4) awk looks at the info and pulls the second
> field
> > > out, where the
> > > fields are separated by whitespace by default.
> > > 
> > > 5) Then awk -F':' is used again to pull the
> second
> > > field out, where the
> > > fields are separated by a colon.
> > > 
> > > The individual outputs follow:
> > > 
> > > 1)
> > > 
> > > eth0      Link encap:Ethernet  HWaddr
> > > 00:80:AD:0C:BA:43
> > >           inet addr:192.168.1.42 
> > > Bcast:192.168.255.255
> > > Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST 
> > > MTU:1500
> > > Metric:1
> > >           RX packets:34866 errors:0 dropped:0
> > > overruns:0 frame:0
> > >           TX packets:5882 errors:0 dropped:0
> > > overruns:0 carrier:0
> > >           collisions:0 txqueuelen:100
> > >           RX bytes:7133322 (6.8 MiB)  TX
> > > bytes:850473 (830.5 KiB)
> > >           Interrupt:3 Base address:0xd800
> > > 
> > > lo        Link encap:Local Loopback
> > >           inet addr:127.0.0.1  Mask:255.0.0.0
> > >           UP LOOPBACK RUNNING  MTU:16436 
> Metric:1
> > >           RX packets:8 errors:0 dropped:0
> overruns:0
> > > frame:0
> > >           TX packets:8 errors:0 dropped:0
> overruns:0
> > > carrier:0
> > >           collisions:0 txqueuelen:0
> > >           RX bytes:400 (400.0 b)  TX bytes:400
> > > (400.0 b)
> > > 
> > > 2)
> > >           inet addr:192.168.1.42 
> > > Bcast:192.168.255.255
> > > Mask:255.255.0.0 inet addr:127.0.0.1 
> Mask:255.0.0.0
> > > 
> > > 3)
> > >           inet addr:192.168.1.42 
> > > Bcast:192.168.255.255
> > > Mask:255.255.0.0
> > > 
> > > 4)
> > > addr:192.168.1.42
> > > 
> > > 5)
> > > 192.168.1.42
> > > 
> > > 
> > > Now don't we all love the pipe command. 
> Hopefully
> > > if you are having
> > > trouble with the above command this explanation
> can
> > > step you through the
> > > issues.
> > > 
> > > Eric
> > > 
> > > 
> > > 
> > > _______________________________________________
> > > OLUG mailing list
> > > OLUG at olug.org
> > > http://lists.olug.org/mailman/listinfo/olug
> > 
> > 
> > =====
> > Winning an argument on the internet is like
> getting 1st place 
> > at the Special Olympics
> > 
> > *****************************************
> > GAIM ID:  cmmiller1973
> > *****************************************
> > 
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> 
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=====
Winning an argument on the internet is like getting 1st place at the Special Olympics

*****************************************
GAIM ID:  cmmiller1973
*****************************************

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