1. root@nat-shunt-v230301:/# ip -br a | grep '^mac'
    2. mace3fb3e9d21e3@br-netns-router UP             172.18.12.1/16 
    3. mac08f2462d1dbd@br-netns-router UP             172.18.12.2/16 
    4. macd14307394c91@br-netns-router UP             172.18.12.3/16 
    5. mac15e55e25b0c5@br-netns-router UP             172.18.12.4/16 
    6. root@nat-shunt-v230301:/# 
    7. root@nat-shunt-v230301:/# ip -br a | grep '^mac' | awk  '{print $NF}'  | awk -F '/' '{print $1}'
    8. 172.18.12.1
    9. 172.18.12.2
    10. 172.18.12.3
    11. 172.18.12.4
    12. root@nat-shunt-v230301:/# 
    13. root@nat-shunt-v230301:/# 
    14. root@nat-shunt-v230301:/# 
    15. root@nat-shunt-v230301:/# ip -br a | grep '^mac' | awk '{split($NF, a, "/"); print a[1]}'
    16. 172.18.12.1
    17. 172.18.12.2
    18. 172.18.12.3
    19. 172.18.12.4