Print (as a hexstring) the contents of a dhcp6c_duid file for the dhcp6c DHCPv6 client

dhcp6c_attduid.sh

#!/bin/sh
# File: dhcp6c-attduid.sh
# Description: Script to print (as a hexstring) the contents of a dhcp6c_duid
# file for the dhcp6c DHCPv6 client.
# Intended for use with routers connected to u-Verse Fiber with the
# Residential Gateway bypassed.

# this awk one-liner should be fully portable
printduidhexstring() { echo -n "$*" | awk 'BEGIN{for(n=0;n<256;n++)ord[sprintf("%c",n)]=n}{len=split($0,c,"");printf("%02x00000200000de9",len+6);for(i=1;i<=len;i++)printf("%x",ord[c[i]]);print("")}'; }
echo "Print (as a hexstring) the contents of a dhcp6c_duid file for the dhcp6c DHCPv6 client."
echo "Step 1) RG information"

while read -p "  Manufacturer [1=Pace, 2=Motorola]: " mfg; do
	([ "$mfg" = "1" ] || [ "$mfg" = "2" ]) && break
done
while read -p "  Serial number: " serial; do [ -n "$serial" ] && break; done
echo

[ "$mfg" = "1" ] && mfg="00D09E" || mfg="001E46"
printduidhexstring "$mfg-$serial"

echo
echo "Step 2) Type the above into a hex editor or something and save it as dhcp6c_duid"
echo "Step 3) Move the file you created into the appropriate path on your system"
echo "Finished"