jq最简单的功能就是格式化。
给一段json（下面一直要用到）：
{"code":0,"data":{"01":[{"answer":{"time_consume":"0.32","records":[{"ttl":5,"value":"39.156.69.79","ip_location":"北京"},{"ttl":5,"value":"220.181.38.148","ip_location":"北京"}],"error":""}}],"852":[{"answer":{"time_consume":"0.23","records":[{"ttl":600,"value":"39.156.69.79","ip_location":"北京"},{"ttl":600,"value":"220.181.38.148","ip_location":"北京"}],"error":""}}],"86":[{"answer":{"time_consume":"0.00","records":[{"ttl":4,"value":"220.181.38.148","ip_location":"北京"},{"ttl":4,"value":"39.156.69.79","ip_location":"北京"}],"error":""}}]}}
看着心累，对不对？

这时，我们可以：
$ echo '{"code":0,"data":{"01":[{"answer":{"time_consume":"0.32","records":[{"ttl":5,"value":"39.156.69.79","ip_location":"北京"},{"ttl":5,"value":"220.181.38.148","ip_location":"北京"}],"error":""}}],"852":[{"answer":{"time_consume":"0.23","records":[{"ttl":600,"value":"39.156.69.79","ip_location":"北京"},{"ttl":600,"value":"220.181.38.148","ip_location":"北京"}],"error":""}}],"86":[{"answer":{"time_consume":"0.00","records":[{"ttl":4,"value":"220.181.38.148","ip_location":"北京"},{"ttl":4,"value":"39.156.69.79","ip_location":"北京"}],"error":""}}]}}' | jq
它会把这一长串json格式化为人看的东西

就是这样的（排版被吃了）：
{
"code": 0,
"data": {
"01": [
{
"answer": {
"time_consume": "0.32",
"records": [
{
"ttl": 5,
"value": "39.156.69.79",
"ip_location": "北京"
},
{
"ttl": 5,
"value": "220.181.38.148",
"ip_location": "北京"
}
],
"error": ""
}
}
],
"852": [
{
"answer": {
"time_consume": "0.23",
"records": [
{
"ttl": 600,
"value": "39.156.69.79",
"ip_location": "北京"
},
{
"ttl": 600,
"value": "220.181.38.148",
"ip_location": "北京"
}
],
"error": ""
}
}
],
"86": [
{
"answer": {
"time_consume": "0.00",
"records": [
{
"ttl": 4,
"value": "220.181.38.148",
"ip_location": "北京"
},
{
"ttl": 4,
"value": "39.156.69.79",
"ip_location": "北京"
}
],
"error": ""
}
}
]
}
}

并且，还是带高亮的！
这只是最基础的用法，jq还有很多高级用法，比如筛选数据。