Shell Programming and Scripting

<RequestNetRates xmlns="http://xmlns.fedex.com/RateVisibility">
    <VersionNumber>1.3.3</VersionNumber>
    <TransactionDate>2013-02-12T04:14:02Z</TransactionDate>
    <RateDate>2013-02-12</RateDate>
    <RequestKey>INTLRS_1800182_en_US_KG_IPDE</RequestKey>
    <Express>
        <RequestParameters>
            <AccountNumber>610013406</AccountNumber>
            <RateCurrencyCode>EUR</RateCurrencyCode>
            <RegionLocatorPageFlag>Y</RegionLocatorPageFlag>
            <RateWeightUnitOfMeasureCode>KG</RateWeightUnitOfMeasureCode>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>01I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>37I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>86I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>18I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>25I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>15I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>17I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>61I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>84I</ServiceDescriptionCode>
            </ServiceDescriptionData>
            <ServiceDescriptionData>
                <ServiceDescriptionCode>70I</ServiceDescriptionCode>
            </ServiceDescriptionData>
        </RequestParameters>
    </Express>
</RequestNetRates>

totalline=`cat data.xml |wc -l`
#get line num containing pased data
ln=`cat -n|grep -P '^.*$1*$'|head -1|grep -oP '^[0-9]+'
#firstnode according to your given data is 4 lines above this line so
ln=`echo $ln -4 |bc`
#now we need 2nd appearance of RequestNetRates from here (including this line)
 
temp=`echo $totalline-$ln|bc`
lastline=`cat -n data.xml |tail -$temp |grep RequestNetRates|head -2 | tail -1 | grep -wP '^[0-9]*'`
 
#so we get firstnode RequestNetRates at ln and 2nd node at lastline
 
# now to get content
lastline=`echo $lastline-$ln|bc`
tail -temp data.xml|head -$lastline >filterdata.xml

awk -F'[<>]' -v D="1800182" ' /RequestKey/ {
                v = $3;
                sub(/[a-zA-Z0-9]*_/,X,v);
                sub(/_.*/,X,v);
                if(v == D) {
                        f = 1;
                        print T;
                }
        } /<\/RequestNetRates>/ && f {
                print $0;
                f = 0;
                T = "";
        } f == 0 {
                T = T RS $0 ;
        } f == 1 {
                print $0;
} ' data.xml