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Script to find one configured IP address used for communication via default route on Linux using ip command
#!/bin/sh
DEV=$(ip route list | sed -n '/^default/s/.*dev \(\S\+\).*/\1/p')
IP=$(ip route list | sed -n '/^default/s/.*src \(\S\+\).*/\1/p')
ip address list dev $DEV | grep -m1 -o "$IP/[0-9]\+"
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