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Can you limit the compare on "comm" command

 
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Top Forums UNIX for Dummies Questions & Answers Can you limit the compare on "comm" command
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Old 03-23-2007
Can you limit the compare on "comm" command- ANSWER FOUND PLEASE IGNORE.
I need to find deleted records from a file. I compare yesterdays file.old to todays file.new. I need to find the records that were in yesterdays file that are not in todays. My file is fixed field. If I run a "comm -23" obviously what i find is not necesarilly a delete, it could be a change.

The first 10 characters of each line are always static. So my option is to cut the first 10 chars from each file into seperate fiels. COmpare these seperate files. That way I find true delete records. Problem is I need the rest of the record that I cut off. I know I can somehow creatively use awk and grep to rebuild these, but I was wondering:

Is there an option to pass to the com command to tell it to only compare the frist 10 characters of each line inmy 2 files? Thus making all the extra work not necessary.

Thank you.

I figured out a way to do this. thank you all for viewing the message.
Last edited by eja; 03-28-2007 at 11:21 AM..
 
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LEARN ABOUT CENTOS

ldns-compare-zones

ldns-compare-zones(1)					      General Commands Manual					     ldns-compare-zones(1)

NAME

       ldns-compare-zones - read and compare two zonefiles and print differences

SYNOPSIS

       ldns-compare-zones [-c] [-i] [-d] [-z] [-s] ZONEFILE1 ZONEFILE2

DESCRIPTION

       ldns-compare-zones reads two DNS zone files and prints number of differences.
       Output is formated to:
	       +NUM_INS        -NUM_DEL        ~NUM_CHG

       The  major  comparison  is  based on the owner name. If an owner name is present in zonefile 1, but not in zonefile 2, the resource records
       with this owner name are considered deleted, and counted as NUM_DEL. If an owner name is present in zonefile 2, but not in zonefile 1,  the
       resource  records with this owner name are considered inserted, and counted as NUM_INS. If an owner name is present in both, but there is a
       difference in the amount or content of the records, these are considered changed, and counted as NUM_CHG.

OPTIONS

       -c     Print resource records whose owner names are in both zone files, but with different resource records. (a.k.a. changed)

       -i     Print resource records whose owner names are present only in ZONEFILE2 (a.k.a. inserted)

       -d     Print resource records whose owner names are present only in ZONEFILE1 (a.k.a. deleted)

       -a     Print all changes. Specifying this option is the same as specifying -c -i amd -d.

       -z     Suppress zone sorting; this option is not recommended; it can cause records to be incorrectly marked as changed,	depending  of  the
	      nature of the changes.

       -s     Do  not  exclude the SOA record from the comparison.  The SOA record may then show up as changed due to a new serial number.  Off by
	      default since you may be interested to know if (other zone apex elements) have changed.

       -h     Show usage and exit

       -v     Show the version and exit

AUTHOR

       Written by Ondej Sury <ondrej@sury.org> for CZ.NIC, z.s.p.o. (czech domain registry)

REPORTING BUGS

       Report bugs to <ondrej@sury.org>.

COPYRIGHT

       Copyright (C) 2005 CZ.NIC, z.s.p.o.. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A	PARTICULAR
       PURPOSE.

								    17 Oct 2007 					     ldns-compare-zones(1)