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Full Discussion: sed/awk : how to delete lines based on IP pattern ?
Top Forums Shell Programming and Scripting sed/awk : how to delete lines based on IP pattern ? Post 302565220 by albator1932 on Monday 17th of October 2011 10:13:40 AM
Old 10-17-2011
sed/awk : how to delete lines based on IP pattern ?
Hi,

I would like to delete lines in /etc/hosts on few workstations, basically I want to delete all the lines for a list of machines like this :

Code:
for HOST in $(cat stations.lst |uniq)
do
# echo -n "$HOST"
  if ping -c 1 $HOST  > /dev/null 2>&1
  then
      HOSTNAME_val=`rsh  $HOST "sed whatever /etc/hosts"`
      val1=`echo $HOSTNAME_val` 
    echo $val1
      else 
       echo "$HOST ; not responding"
  fi
done

"whatever" means "all the lines that contain 152.15.x.y, 152.9.x.y, 152.19.x.y and 44.33.x.y"

I need help for the sed part.
I was thinking of something like
Code:
sed '/152.15./d' /etc/hosts

but I don't know how to put my four patterns on the same line (or even if is it possible).

Thanks for your help
 

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LEARN ABOUT SUSE

net::time

Net::Time(3pm)						 Perl Programmers Reference Guide					    Net::Time(3pm)

NAME

       Net::Time - time and daytime network client interface

SYNOPSIS

	   use Net::Time qw(inet_time inet_daytime);

	   print inet_time();	       # use default host from Net::Config
	   print inet_time('localhost');
	   print inet_time('localhost', 'tcp');

	   print inet_daytime();       # use default host from Net::Config
	   print inet_daytime('localhost');
	   print inet_daytime('localhost', 'tcp');

DESCRIPTION

       "Net::Time" provides subroutines that obtain the time on a remote machine.

       inet_time ( [HOST [, PROTOCOL [, TIMEOUT]]])
	   Obtain the time on "HOST", or some default host if "HOST" is not given or not defined, using the protocol as defined in RFC868. The
	   optional argument "PROTOCOL" should define the protocol to use, either "tcp" or "udp". The result will be a time value in the same
	   units as returned by time() or undef upon failure.

       inet_daytime ( [HOST [, PROTOCOL [, TIMEOUT]]])
	   Obtain the time on "HOST", or some default host if "HOST" is not given or not defined, using the protocol as defined in RFC867. The
	   optional argument "PROTOCOL" should define the protocol to use, either "tcp" or "udp". The result will be an ASCII string or undef upon
	   failure.

AUTHOR

       Graham Barr <gbarr@pobox.com>

COPYRIGHT

       Copyright (c) 1995-2004 Graham Barr. All rights reserved.  This program is free software; you can redistribute it and/or modify it under
       the same terms as Perl itself.

perl v5.12.1							    2010-04-26							    Net::Time(3pm)
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