在使用f5命令時，有時我們需要查看返回結果的格式是否正確，這時候就需要把結果顯示為json格式。使用f5命令可以很方便的實現這一點，下面我們來簡單介紹一下。

首先，我們需要在f5命令后面加上”-o json”參數，這樣返回結果就會以json的格式顯示。

f5 -o json

下面是一個示例的f5命令，返回一個虛擬服務器的信息，并以json格式顯示結果：

root@f5:~# f5 -o json show ltm virtual /Common/test_vs
{
 "kind": "tm:ltm:virtual:virtualstate",
 "name": "test_vs",
 "partition": "Common",
 "fullPath": "/Common/test_vs",
 "generation": 166,
 "selfLink": "https://localhost/mgmt/tm/ltm/virtual/~Common~test_vs?ver=14.1.2",
 "addressStatus": "yes",
 "autoLasthop": "default",
 "cmpEnabled": "no",
 "connectionLimit": 0,
 "description": "",
 "destination": "/Common/10.0.0.1:80",
 "disabled": false,
 "enable": true,
 "gtmScore": 0,
 "ipForward": false,
 "mask": "255.255.255.255",
 "mirror": false,
 "mobileAppTunnel": "disabled",
 "pool": "/Common/test_pool",
 "poolReference": {
"link": "https://localhost/mgmt/tm/ltm/pool/~Common~test_pool?ver=14.1.2"
 },
 "profiles": [
{
"kind": "tm:ltm:virtual:profile",
"name": "fasthttp",
"partition": "Common",
"fullPath": "/Common/fasthttp",
"generation": 21,
"selfLink": "https://localhost/mgmt/tm/ltm/virtual/~Common~test_vs/profiles/~Common~fasthttp?ver=14.1.2"
}
 ],
 "rateLimit": "no",
 "rateLimitDstMask": 0,
 "rateLimitMode": "object",
 "rateLimitSrcMask": 0,
 "rateLimitUnit": "pps",
 "requestLearn": "no",
 "source": "0.0.0.0/0",
 "sourceAddressTranslation": {},
 "sourcePort": "preserve",
 "synCookieStatus": "not-activated",
 "translateAddress": "disabled",
 "translatePort": "disabled",
 "vlansEnabled": false,
 "vsIndex": 101,
 "vsIndexConf": "yes"
}

可以看到，返回結果已經以json的格式顯示，更加直觀易懂。

總結來說，如果想要讓f5命令返回的結果以json格式顯示，只需要在命令后面加上”-o json”參數即可。