use -n
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		@@ -10,22 +10,23 @@ echo "VPN_IPV4_ADDRESS=${VPN_IPV4_ADDRESS}"
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echo "VPN_IPV6_ADDRESS=${VPN_IPV6_ADDRESS}"
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echo "-- <end> inner_basic.sh --"
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if [ -z "${VPN_IPV4_ADDRESS}" ]
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if [ -n "${VPN_IPV4_ADDRESS}" ]
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then
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    ip addr add ${VPN_IPV4_ADDRESS} dev vpn
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fi
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if [ -z "${VPN_IPV6_ADDRESS}" ]
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if [ -n "${VPN_IPV6_ADDRESS}" ]
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then
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    ip addr add ${VPN_IPV6_ADDRESS} dev vpn
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fi
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if [ -z "${VPN_IPV4_ADDRESS}" ]
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if [ -n "${VPN_IPV4_ADDRESS}" ]
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then
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    ip -4 route add default dev vpn
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fi
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if [ -z "${VPN_IPV6_ADDRESS}" ]
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if [ -n "${VPN_IPV6_ADDRESS}" ]
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then
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    ip -6 route add default dev vpn
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fi
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