Openwrt/openwrt/package/base-files/default/etc/nvram.sh

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#!/bin/ash
# allow env to override nvram
nvram () {
if [ -x /usr/sbin/nvram ]; then
case $1 in
get) eval "echo \${$2:-\$(command nvram get $2)}";;
*) command nvram $*;;
esac
else
case $1 in
get) eval "echo \${$2:-\${DEFAULT_$2}}";;
*);;
esac
fi
}