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Full Discussion: Combine awk statements
Top Forums Shell Programming and Scripting Combine awk statements Post 302410244 by numele on Monday 5th of April 2010 11:36:27 AM
Old 04-05-2010
Combine awk statements
I have an awk statement that works but I am calling awk twice and I know there has to be a way to combine the two statements into one. The purpose is to pull out just the ip address from loopback1.
Code:
cat config.txt | nawk 'BEGIN {FS="\n"}{RS="!"}{if ( $0 ~ "interface loopback1" ) print$4}' | nawk 'gsub(/\/32/,""){print $3}'

Sample config:
Code:
!
interface loopback0 loopback
 description test1
 ip address 10.30.133.5/32 tag 100
  ip source-address tftp ftp
!
interface loopback1 loopback
 description test2
 ip address 10.159.1.5/32 tag 101
!
interface loopback2 loopback
 description test3
 ip address 10.159.1.170/32 tag 102
  ip source-address radius
!

 

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LEARN ABOUT REDHAT

lo

LO(4)                                                      BSD Kernel Interfaces Manual                                                      LO(4)

NAME

     lo -- software loopback network interface

SYNOPSIS

     device loop

DESCRIPTION

     The loop interface is a software loopback mechanism which may be used for performance analysis, software testing, and/or local communication.
     As with other network interfaces, the loopback interface must have network addresses assigned for each address family with which it is to be
     used.  These addresses may be set or changed with the SIOCSIFADDR ioctl(2).  The loopback interface should be the last interface configured,
     as protocols may use the order of configuration as an indication of priority.  The loopback should never be configured first unless no hard-
     ware interfaces exist.

     If the transmit checksum offload capability flag is enabled on a loopback interface, checksums will not be generated by IP, UDP, or TCP for
     packets sent on the interface.

     If the receive checksum offload capability flag is enabled on a loopback interface, checksums will not be validated by IP, UDP, or TCP for
     packets received on the interface.

     By default, both receive and transmit checksum flags will be enabled, in order to avoid the overhead of checksumming for local communication
     where data corruption is unlikely.  If transmit checksum generation is disabled, then validation should also be disabled in order to avoid
     packets being dropped due to invalid checksums.

DIAGNOSTICS

     lo%d: can't handle af%d.  The interface was handed a message with addresses formatted in an unsuitable address family; the packet was
     dropped.

SEE ALSO

     inet(4), intro(4)

HISTORY

     The lo device appeared in 4.2BSD.  The current checksum generation and validation avoidance policy appeared in FreeBSD 8.0.

BSD                                                               March 15, 2009                                                               BSD
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