Dell warranty check for FreeBSD

Dell-warranty check

#!/bin/sh
if [ $1  = ""] ; then
echo $1
SERIAL=`kenv | grep system | grep serial | awk 'BEGIN{FS="="}{ print substr(substr( $2,2),1,7)}'`

else
SERIAL=$1
fi
echo "Service Tag :" $SERIAL
/usr/local/bin/curl -G "http://www.dell.com/support/troubleshooting/jp/ja/jpbsd1/Servicetag/"$SERIAL  2>/dev/null  |\
grep -A1  TopTwoWarrantyListItem | strings | grep \<b\>|  \
gawk 'BEGIN{FS="<b>"}{  a=substr($3,0,10); if (a>b) { b=a; } }END {print  "EOL of DirectLine: " b }'

Requirements:　net/curl
lang/gawk (?)