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Full Discussion: swapping lines that match a condition using sed, perl or the like
Top Forums Shell Programming and Scripting swapping lines that match a condition using sed, perl or the like Post 302352058 by TheBigAmbulance on Thursday 10th of September 2009 09:46:46 AM
Old 09-10-2009
swapping lines that match a condition using sed, perl or the like
I'm a bit new to regex and sed/perl stuff, so I would like to ask for some advice. I have tried several variations of scripts I've found on the net, but can't seem to get them to work out just right.

I have a file with the following information...

Code:
# Host 1
host 45583 {
    filename "junk1.cm";
    hardware ethernet 11:42:a3:d4:55:83;
    fixed-address 10.100.34.114;
    }
# Host 2
host D78C3 {
    filename "junk5.cm";
    fixed-address 10.100.34.117;
    hardware ethernet 11:42:a3:FD:78:C3;
    }
# Host 3
host 3A684 {
    filename "junk6.cm";
    fixed-address 10.100.34.119;
    hardware ethernet 11:42:a3:13:a6:84;
    }
# Host 4
host 46d54 {
    filename "junk4.cm";
    fixed-address 10.100.34.120;
    hardware ethernet 23:10:3d:14:6d:54;
    }

I have another script that is rearranging this just fine with one exception. The lines that have 'fixed-address' as the last line before the close bracket are working fine. The lines that have 'hardware ethernet' on them are causing my big script to misinterpret the information.

My desired result would be the following...

Code:
# Host 1
host 45583 {
    filename "junk1.cm";
    hardware ethernet 11:42:a3:d4:55:83;
    fixed-address 10.100.34.114;
    }
# Host 2
host D78C3 {
    filename "junk5.cm";
    hardware ethernet 11:42:a3:FD:78:C3;
    fixed-address 10.100.34.117;
    }
# Host 3
host 3A684 {
    filename "junk6.cm";
    hardware ethernet 11:42:a3:13:a6:84;
    fixed-address 10.100.34.119;
    }
# Host 4
host 46d54 {
    filename "junk4.cm";
    hardware ethernet 23:10:3d:14:6d:54;
    fixed-address 10.100.34.120;
    }

So what I'd like to build is a script that would search for 'fixed-address'. If it's followed by '}', do nothing. If it's followed by 'hardware ethernet', flip the lines 'fixed-address' and 'hardware ethernet'.

Does anyone have any advice on how they think that they would accomplish this? I'd appreciate any help that someone could provide.
Last edited by TheBigAmbulance; 09-10-2009 at 11:33 AM..
 

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LEARN ABOUT DEBIAN

setether

SETETHER(8)						      System Manager's Manual						       SETETHER(8)

NAME

       setether - Set the ethernet address for use with DECnet

SYNOPSIS

       setether <if> [<if>...]|all [options]

DESCRIPTION

       Set ethernet MAC address on ethernet adaptors

       This  script should be run at system startup. It will change the ethernet hardware (MAC) address of any or all ethernet interfaces to match
       the DECnet node address. DECnet requires that the MAC address of all ethernet adaptors running the protocol be set approriately.  If you do
       not run setether then you must change the ethernet address in some other way for DECnet to work.
       By  default no ethernet interfaces will have their MAC addresses changed by setether, if you specify all then all interfaces name eth* will
       be changed, otherwise a list of interface names can be specified.  setether will enable (UP) all interfaces it changes  the  MAC  addresses
       of.
       (2.4  only) The first interface specified on the command-line will also be made the default interface for DECnet operations (ie attempts to
       contact nodes not in the neighbour table will be done over this interface).
       This script must be run with the interface inactive, it is normally run from /etc/init.d/decnet before TCP/IP starts up.

EXAMPLES

       set the MAC address of eth0.

	   # /sbin/setether eth0

       set the MAC address of all ethernet interfaces

	   # /sbin/setether all

HELPFUL HINTS

       If you have multiple ethernet cards on your system and they are connected to the the same network you should specify which one you want	to
       use  for DECnet communication on the setether command line, otherwise they will both be given the same MAC address and this is probably not
       what you want.
       Running DECnet on multiple ethernet interfaces only works under Linux 2.4. If you are running Linux 2.2 then  the  interface  name  on  the
       setether command line must match the one in /etc/decnet.conf(5).

SEE ALSO

       decnet.conf(5), dntype(1), dndir(1), dndel(1), dnetd(8), dnping(1)

DECnet utilities						   March 01 2001						       SETETHER(8)
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