ip address: add page (#3930)

pages/linux/ip-address.md

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+# ip address
+
+> IP Address management subcommand.
+
+- List network interfaces and their associated IP addresses:
+
+`ip address`
+
+- Filter to show only active network interfaces:
+
+`ip address show up`
+
+- Display information about a specific network interface:
+
+`ip address show dev {{network_interface}}`
+
+- Add an IP address to a network interface:
+
+`ip address add {{ip_address}} dev {{network_interface}}`
+
+- Remove an IP address from a network interface:
+
+`ip address delete {{ip_address}} dev {{network_interface}}`
+
+- Delete all IP addresses in a given scope from a network interface:
+
+`ip address flush dev {{network_interface}} scope {{global|host|link}}`