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Full Discussion: awk Help
Top Forums Shell Programming and Scripting awk Help Post 303029243 by joeg1484 on Wednesday 23rd of January 2019 03:40:55 PM
Old 01-23-2019
awk Help
Hi All,


This should be simple, but for some reason I cant figure out why the following wont work:



Code:
 ifconfig eth0 |awk 'BEGIN {FS=":"; print "IP Address is: "} $1 == "inet addr" { print $2 }'



That should print the IP address of eth0. Here is the output of the ifconfig eth0 command:


Code:
eth0      Link encap:Ethernet  HWaddr AC:16:2D:75:46:C8  
          inet addr:123.123.123.123  Bcast:123.123.123.255  Mask:255.255.255.0
          inet6 addr: blaa
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:292643058 errors:0 dropped:6400 overruns:0 frame:0
          TX packets:704382748 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:164659504340 (153.3 GiB)  TX bytes:959885251512 (893.9 GiB)
          Interrupt:32


Im setting the FS=":" and printing the second filed {$2}, so not sure why its not working.


Thanks!
Joe

--- Post updated at 01:40 PM ---

This seems to work, however:


Code:
 ip a show eth0 |awk '$1 == "inet" {print $2}'


Perhaps the issue is the field separator not working correctly?
 

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LEARN ABOUT DEBIAN

vlan-interfaces

VLAN-INTERFACES(5)						   File formats 						VLAN-INTERFACES(5)

NAME

       /etc/network/interfaces (vlan) - vlan extensions for the interfaces(5) file format

DESCRIPTION

       /etc/network/interfaces	contains  network  interface  configuration  information  for  the  ifup(8)  and ifdown(8) commands.  This manpage
       describes the vlan extensions to the standard interfaces(5) file format.

       Primary extensions exist to make and destroy vlan interfaces, secondary extensions exist for ipv4 interface manipulation which  are  gener-
       ally needed when using (a lot of) vlans.

VLAN CREATION

       Vlan  interface	definitions  exist  of the vlan interface name, and an optional 'raw-device' parameter.  Vlan interfaces are numbered 1 to
       4095.  You have the option to have interface names zero-padded to 4 numbers, or just the plain digits without leading zero.  The  following
       example shows four ways to create a vlan with id 1 on interface eth0.  They all result in different names.

	iface eth0.1 inet static
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface vlan1 inet static
	    vlan-raw-device eth0
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface eth0.0001 inet static
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface vlan0001 inet static
	    vlan-raw-device eth0
	    address 192.168.1.1
	    netmask 255.255.255.0

	# We don't have br support out of the box
	iface br0.2 inet static
	    vlan-raw-device br0
	    address 192.168.1.1
	    netmask 255.255.255.0

	# Aliases are ignored
	iface br0.2:1 inet static
	    address 192.168.1.1
	    netmask 255.255.255.255

EXTRA IFACE OPTIONS

       Usually someone who uses vlans also wants to do some other manipulations with the ip stack or interface.

       vlan-raw-device devicename
	      Indicates the device to create the vlan on.  This is ignored when the devicename is part of the vlan interface name.

       ip-proxy-arp 0|1
	      Turn proxy-arp off or on for this specific interface.  This also works on plain ethernet like devices.

       ip-rp-filter 0|1|2
	      Set the return path filter for this specific interface.  This also works on plain ethernet like devices.

       hw-mac-address mac-address
	      This sets the mac address of the interface before bringing it up.  This works on any device that allows setting the hardware address
	      with the ip command.

AUTHOR

       This manpage was adapted from interfaces(5) by Ard van Breemen <ard@kwaak.net>

SEE ALSO

       vconfig(8) interfaces(5)

vlan								 September 30 2007						VLAN-INTERFACES(5)
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