Simple xml parser

xmlparser.sh

#!/bin/bash
#
#     version: 0.02
# description: When you are limited to work w/o xpath.
#
# List regions: 
#   xmlparser [file] lsreg
# 
# Get regions:
#   xmlparser [file] getreg region
#
# Create sample.xml:
#   xmlparser makesample
#

lsreg () {
 echo cat "//Region/@Name"
}

getreg () {
 echo cat "//Region[@Name=\"$1\"]/IpRange/@Subnet"
}

parse () {
 $2 $3 | xmllint --shell $1 | sed -n 's/[^\"]*\"\([^\"]*\)\"[^\"]*/\1/gp' | sort -V
}

makesample () {
cat << EOF > sample.xml
<?xml version="1.0" encoding="utf-8"?>
<AzurePublicIpAddresses xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Region Name="australiac2">
    <IpRange Subnet="13.104.158.224/27" />
    <IpRange Subnet="20.36.64.0/19" />
  </Region>
  <Region Name="germanywc">
    <IpRange Subnet="13.104.144.224/27" />
    <IpRange Subnet="13.104.145.128/27" />
  </Region>
  <Region Name="japaneast">
    <IpRange Subnet="13.71.128.0/19" />
    <IpRange Subnet="13.73.0.0/19" />
  </Region>
  <Region Name="japanwest">
    <IpRange Subnet="13.73.232.0/21" />
    <IpRange Subnet="20.39.176.0/21" />
  </Region>
  <Region Name="usnorth">
    <IpRange Subnet="13.105.26.0/24" />
    <IpRange Subnet="13.105.37.64/26" />
  </Region>
  <Region Name="europenorth">
    <IpRange Subnet="13.69.128.0/17" />
    <IpRange Subnet="13.70.192.0/18" />
  </Region>
  <Region Name="southafrican">
    <IpRange Subnet="13.104.158.128/27" />
    <IpRange Subnet="13.104.158.160/28" />
  </Region>
  <Region Name="ussouth">
    <IpRange Subnet="13.65.0.0/16" />
    <IpRange Subnet="13.66.0.0/17" />
  </Region>
  <Region Name="uswestcentral">
    <IpRange Subnet="13.71.192.0/18" />
    <IpRange Subnet="13.77.192.0/19" />
  </Region>
</AzurePublicIpAddresses>
EOF
}

if [ ! $1 ]; then sed -ne '/^#$/,/^$/p' $0
elif [ "$1" == "makesample" ]; then makesample
else parse $1 $2 $3
fi