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Full Discussion: how to extract info from a file using awk
Top Forums Shell Programming and Scripting how to extract info from a file using awk Post 302276162 by on9west on Tuesday 13th of January 2009 06:57:15 AM
Old 01-13-2009
Quote:
Originally Posted by radoulov
Code:
awk '{print$1,$(NF-1),$NF}' RS= interfaces.txt

Thank you for your help

I google to study what the RS= is. It is to breaks up the line into fields.

However, if my interfaces.txt like this (do not have blank line seperated). How to do then?

Quote:
LIS_SIM_UX7
master tcp ether dc1ibm23.server.ha.org.hk 26007
LIS_SIM_UX7_SB
master tcp ether dc1ibm22.server.ha.org.hk 26007
LIS_SIM_UX9
master tcp ether dc1ibm23.server.ha.org.hk 26009
LIS_SIM_UX9_SB
master tcp ether dc1ibm22.server.ha.org.hk 26009
LIS_SIM_ST1
master tcp ether cdcibm26.server.ha.org.hk 35501
LIS_SYB_UT1
master tcp ether dc1ibm23.server.ha.org.hk 61199
Many thanks
Valentino
 

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LEARN ABOUT CENTOS

tcp.h

tcp.h(3HEAD)                                                          Headers                                                         tcp.h(3HEAD)

NAME

       tcp.h, tcp - definitions for the Internet Transmission Control Protocol (TCP)

SYNOPSIS

       #include <netinet/tcp.h>

DESCRIPTION

       The <netinet/tcp.h> header defines the following macro for use as a socket option at the IPPROTO_TCP level:

       TCP_NODELAY     Avoid coalescing of small segments.

       The macro is defined in the header. The implementation need not allow the value of the option to be set with setsockopt() or retrieved with
       getsockopt().

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Standard                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       getsockopt(3XNET), socket.h(3HEAD), attributes(5), standards(5)

SunOS 5.10                                                          10 Sep 2004                                                       tcp.h(3HEAD)
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