#!/bin/sh



#USE AT YOUR OWN RISK.

#THIS SCRIPT DOES NOT COME WITH ANY WARRANTY WHATSOEVER.

#

#Backs up selected nvram variables in "nvram export --set" format.

#

#Correctly handles multi-line entries.

#

#Thanks to ryzhov_al for basic approach.

#

#Should work equally well with both MIPS and ARM builds.

#

#Looks for a list of items to export in $etc/scriptname.ini

#OR enter items to grep for below.

#

#The items list is a list of regular expressions to match against the

#nvram variable names.

#

#Script assumes all entries are at beginning of line(prefixed with ^).

#

#Leave items list blank to backup up all of nvram.  Resulting in essentially

#the same output as MIPS "nvram export --set"

#

#The items list below is only intended as example and is not complete or

#comprehensive. Customize for your own use.

#

#Edit list below if not using .ini file, it is ignored if .ini file is found



items='

  dhcpd

'



etc=/tmp/etc

base=${0##*/}; base=${base%.*}

config=$etc/$base.ini



#file to output - default to stdout

if [ "$1" != "" ] ; then

  backupfile="$1"

else

  backupfile=/proc/$$/fd/1

fi



grepstr=$( { [ -r $config ] && cat $config || echo "$items" ; } | sed -e 's/[\t ]//g;/^$/d' | sed ':a;N;$!ba;s/\n/\\\|\^/g')



{

echo "#Exporting $grepstr"

for item in $(nvram show 2>/dev/null | grep "^.*=" | grep "$grepstr"  | awk -F= "{print \$1}" | sort -u)

do

  item_value="$(nvram get $item | sed 's!\([\$\"\`]\)!\\\1!g' echo nvgetwasnull)"

  case $item_value in

  nvgetwasnull) ;;

  *) echo "nvram set ${item}=\"${item_value%

nvgetwasnull}\"" ;;

  esac

done

}>"$backupfile"