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Top Forums Shell Programming and Scripting How to convert forward zone file to reverse Post 302281958 by Corona688 on Thursday 29th of January 2009 10:39:02 PM
Old 01-29-2009
There's usually not much reason to use cut when the read builtin can handle delimiters more elegantly. Here it takes two delimiters, period and space, to split the string into words and individual numbers at the same time. It also checks when the first three change and prints out the address entire, as your output data suggests you want.

Code:
IFS=" ."
while read NAME G A B C D && [[ ! -z "$NAME" ]]
do
        if      [[ "$A" != "$AA" ]]     ||
                [[ "$B" != "$BB" ]]     ||
                [[ "$C" != "$CC" ]]
        then
                echo "$A.$B.$C.$D"
        fi

        AA="$A" ; BB="$B" ; CC="$C" ; DD="$D"

        echo -e "$D\tPTR\t$NAME.domain.com"
done < zonefile

 

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ldns-read-zone(1)					      General Commands Manual						 ldns-read-zone(1)

NAME
ldns-read-zone - read a zonefile and print it SYNOPSIS
ldns-read-zone ZONEFILE DESCRIPTION
ldns-read-zone reads a DNS zone file and prints it. The output has 1 resource record per line, and no pretty-printing makeup. OPTIONS
-c Canonicalize all resource records in the zone before printing -d Only print DNSSEC data from the zone. This option skips every record that is not of type NSEC, NSEC3, RRSIG or DNSKEY. DS records are not printed. -h Show usage and exit -n Do not print the SOA record -s Strip DNSSEC data from the zone. This option skips every record that is of type NSEC, NSEC3, RRSIG or DNSKEY. DS records are still printed. -S [[+|0]number | YYYYMMDDxx | unixtime ] Set serial number to the given number, or when preceded by a sign, offset the exisiting number with it. When giving the literal strings YYYYMMDDxx or unixtime, the serial number is tried to be reset in datecounter or in unixtime format respectively. Though is the updated serial number is smaller than the original one, the original one is simply increased by one. When updating a serial number, records of type NSEC, NSEC3, RRSIG and DNSKEY will be skipped when printing the zone. -v Show the version and exit -z Sort the zone before printing (this implies -c) AUTHOR
Written by the ldns team as an example for ldns usage. REPORTING BUGS
Report bugs to <ldns-team@nlnetlabs.nl>. COPYRIGHT
Copyright (C) 2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. 30 May 2005 ldns-read-zone(1)
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