La herramienta ip permite volcar la información relacionada a las direcciones IP de las interfaces de red de un sistema GNU/Linux en formato JSON, lo cual puede ser útil para enviar a un Web Service o cargar en una base de datos.
Para obtener la salida de la herramienta IP en formato JSON, simplemente se debe agregar la opción -j:
root@debian9:~# ip -j a
[{"ifindex":1,"ifname":"lo","flags":["LOOPBACK","UP","LOWER_UP"],"mtu":65536,"qdisc":"noqueue","operstate":"UNKNOWN","group":"default","txqlen":1000,"link_type":"loopback","address":"00:00:00:00:00:00","broadcast":"00:00:00:00:00:00","addr_info":[{"family":"inet","local":"127.0.0.1","prefixlen":8,"scope":"host","label":"lo","valid_life_time":4294967295,"preferred_life_time":4294967295}]},{"ifindex":2,"ifname":"eth0","flags":["BROADCAST","MULTICAST","UP","LOWER_UP"],"mtu":1500,"qdisc":"mq","operstate":"UP","group":"default","txqlen":1000,"link_type":"ether","address":"00:11:dd:55:7a:02","broadcast":"ff:ff:ff:ff:ff:ff","addr_info":[{"family":"inet","local":"192.168.94.45","prefixlen":22,"broadcast":"192.168.97.255","scope":"global","label":"eth0","valid_life_time":4294967295,"preferred_life_time":4294967295}]},{"ifindex":3,"ifname":"eth1","flags":["BROADCAST","MULTICAST","UP","LOWER_UP"],"mtu":1500,"qdisc":"mq","operstate":"UP","group":"default","txqlen":1000,"link_type":"ether","address":"00:a2:22:de:54:77","broadcast":"ff:ff:ff:ff:ff:ff","addr_info":[{"family":"inet","local":"10.54.136.164","prefixlen":24,"broadcast":"10.54.136.255","scope":"global","label":"eth1","valid_life_time":4294967295,"preferred_life_time":4294967295}]}]
Si se desea que tenga un formato más legible para el humano, es posible agregar la opción pretty (-p), la cual incorpora indentación en el código JSON resultante:
root@debian9:~# ip -j -p a
[ {
"ifindex": 1,
"ifname": "lo",
"flags": [ "LOOPBACK","UP","LOWER_UP" ],
"mtu": 65536,
"qdisc": "noqueue",
"operstate": "UNKNOWN",
"group": "default",
"txqlen": 1000,
"link_type": "loopback",
"address": "00:00:00:00:00:00",
"broadcast": "00:00:00:00:00:00",
"addr_info": [ {
"family": "inet",
"local": "127.0.0.1",
"prefixlen": 8,
"scope": "host",
"label": "lo",
"valid_life_time": 4294967295,
"preferred_life_time": 4294967295
} ]
},{
"ifindex": 2,
"ifname": "eth0",
"flags": [ "BROADCAST","MULTICAST","UP","LOWER_UP" ],
"mtu": 1500,
"qdisc": "mq",
"operstate": "UP",
"group": "default",
"txqlen": 1000,
"link_type": "ether",
"address": "00:11:dd:55:7a:02",
"broadcast": "ff:ff:ff:ff:ff:ff",
"addr_info": [ {
"family": "inet",
"local": "192.168.94.45",
"prefixlen": 22,
"broadcast": "192.168.97.255",
"scope": "global",
"label": "eth0",
"valid_life_time": 4294967295,
"preferred_life_time": 4294967295
} ]
},{
"ifindex": 3,
"ifname": "eth1",
"flags": [ "BROADCAST","MULTICAST","UP","LOWER_UP" ],
"mtu": 1500,
"qdisc": "mq",
"operstate": "UP",
"group": "default",
"txqlen": 1000,
"link_type": "ether",
"address": "00:a2:22:de:54:77",
"broadcast": "ff:ff:ff:ff:ff:ff",
"addr_info": [ {
"family": "inet",
"local": "10.54.136.164",
"prefixlen": 24,
"broadcast": "10.54.136.255",
"scope": "global",
"label": "eth1",
"valid_life_time": 4294967295,
"preferred_life_time": 4294967295
} ]
} ]
Por supuesto, ambas opciones (-j y -p) pueden ser utilizadas para cualquier subcomando de la herramienta ip (como "address", "link", "route", etc.)
Para más información:
man ip
