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Full Discussion: Awk, if line after string does not match insert
Top Forums Shell Programming and Scripting Awk, if line after string does not match insert Post 302862913 by numele on Friday 11th of October 2013 03:52:39 PM
Old 10-11-2013
Awk, if line after string does not match insert
I have a large file with interface records. I need to check every record that has the string "encapsulation bridge1483" and if the next line after this does not have "ip description" then I need to insert a line to add "ip description blah_blah_blah.

Sample file:
Code:
interface atm 1/0.190158 point-to-point
 atm pvc 100190158 19 158 aal5snap 768 768 10
 encapsulation pppoe
! 
interface atm 1/0.190158.1
 encapsulation ppp
 ppp authentication pap
 profile any "prof-pppoe"
! 
interface atm 1/0.20203 point-to-point
 atm pvc 100020203 2 203 aal5snap 1500 1500 10
 encapsulation bridge1483
 ip address 10.132.1.1 255.255.255.248
!
interface atm 1/0.80180 point-to-point
 atm pvc 100080180 8 180 aal5snap 3000 3000 10
 encapsulation bridge1483
 ip description won_ton_soup_company
 ip address 10.42.3.1 255.255.255.248
!
interface atm 1/0.100115 point-to-point
 atm pvc 100100115 10 115 aal5snap 6000 6000 10
 encapsulation bridge1483
 ip description dickandjanes
 ip address 10.2.3.1 255.255.255.248
!

What I need to have output:
Code:
interface atm 1/0.190158 point-to-point
 atm pvc 100190158 19 158 aal5snap 768 768 10
 encapsulation pppoe
! 
interface atm 1/0.190158.1
 encapsulation ppp
 ppp authentication pap
 profile any "prof-pppoe"
! 
interface atm 1/0.20203 point-to-point
 atm pvc 100020203 2 203 aal5snap 1500 1500 10
 encapsulation bridge1483
ip description blah_blah_blah
 ip address 10.132.1.1 255.255.255.248
!
interface atm 1/0.80180 point-to-point
 atm pvc 100080180 8 180 aal5snap 3000 3000 10
 encapsulation bridge1483
 ip description won_ton_soup_company
 ip address 10.42.3.1 255.255.255.248
!
interface atm 1/0.100115 point-to-point
 atm pvc 100100115 10 115 aal5snap 6000 6000 10
 encapsulation bridge1483
 ip description dickandjanes
 ip address 10.2.3.1 255.255.255.248
!

 

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LEARN ABOUT NETBSD

ng_atmllc

NG_ATMLLC(4)						   BSD Kernel Interfaces Manual 					      NG_ATMLLC(4)

NAME

     ng_atmllc -- ATM LLC netgraph node type

SYNOPSIS

     #include <netgraph/ng_atmllc.h>

DESCRIPTION

     The atmllc node type translates frames in to and out of ATM LLC encapsulation, as specified by RFC 1483.  In LLC encapsulation the protocol
     of a given protocol data unit (PDU) is specified by an IEEE 802.2 LLC header, possibly followed by an IEEE 802.1a SubNetwork Attachment Point
     (SNAP) header.  This node currently handles the Ethernet and FDDI protocols.

     The node transmits and receives ATM PDUs on the atm hook.	Received PDUs are decoded and forwarded to the ether or fddi hooks as appropriate.
     Data received on the ether or fddi hooks are assumed to be full Ethernet or FDDI packets as appropriate and are encapsulated into a PDU and
     transmitted via the atm hook.

HOOKS

     This node type supports the following hooks:

     atm     ATM connection.  Typically, this hook would be connected to a ng_atm(4) node, which handles transmission of ATM PDUs over an ATM
	     device.

     ether   Ethernet connection.  This hook sends and receives Ethernet frames.  This would normally be connected to an ng_eiface(4) node if in
	     use.

     fddi    FDDI connection.  This hook sends and receives FDDI frames.

CONTROL MESSAGES

     This node type supports the generic control messages.

SHUTDOWN

     This node shuts down upon receipt of a NGM_SHUTDOWN control message, or when all hooks have been disconnected.

SEE ALSO

     netgraph(4), ng_atm(4), ng_eiface(4), ngctl(8)

     J. Heinanen, Multiprotocol Encapsulation over ATM Adaptation Layer 5, RFC 1483.

AUTHORS

     Benno Rice <benno@FreeBSD.org>

BSD
								   March 8, 2004							       BSD
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