演示内容，输出到json1文件中：
cat > json1 << EOF
{"tokens":[{"token":"网络","start_offset":0,"end_offset":2,"type":"CN_WORD","position":0},{"token":"不是","start_offset":2,"end_offset":4,"type":"CN_WORD","position":1},{"token":"法外","start_offset":4,"end_offset":6,"type":"CN_WORD","position":2},{"token":"之地","start_offset":6,"end_offset":8,"type":"CN_WORD","position":3}]}
EOF
1、获取整个JSON对象
cat json1 |jq .
返回内容：
{"tokens": [{"token": "网络","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0},{"token": "不是","start_offset": 2,"end_offset": 4,"type": "CN_WORD","position": 1},{"token": "法外","start_offset": 4,"end_offset": 6,"type": "CN_WORD","position": 2},{"token": "之地","start_offset": 6,"end_offset": 8,"type": "CN_WORD","position": 3}]
}
2、获取所有数组
cat json1 |jq '.[]'
返回内容：
[{"token": "网络","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0},{"token": "不是","start_offset": 2,"end_offset": 4,"type": "CN_WORD","position": 1},{"token": "法外","start_offset": 4,"end_offset": 6,"type": "CN_WORD","position": 2},{"token": "之地","start_offset": 6,"end_offset": 8,"type": "CN_WORD","position": 3}
]
3、获取tokens数组中第1个索引数据
cat json1 |jq '.tokens[0]'
返回内容：
{"token": "网络","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0
}
4、获取tokens数组中第1、2个索引数据
cat json1 |jq '.tokens[0:2]'
返回内容：
[{"token": "网络","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0},{"token": "不是","start_offset": 2,"end_offset": 4,"type": "CN_WORD","position": 1}
]
5、获取tokens数组中第1个索引数据中token的值
cat json1 |jq '.tokens[0].token'
返回内容：
"网络"
6、获取tokens数组中第1个索引数据中token、type的值
cat json1 |jq '.tokens[0].token,.tokens[0].type'
可以简写成：
cat json1 |jq '.tokens[0]|.token,.type'
返回内容：
"网络"
"CN_WORD"
7、获取tokens数组中所有token的值
cat json1 |jq '.tokens[].token'
返回内容：
"网络"
"不是"
"法外"
"之地"
8、迭代数组，使用map函数对数组中的每个元素执行相同的操作
cat json1 |jq '.[]|map(.token)'
返回内容：
["网络","不是","法外","之地"
]
9、添加过滤条件：获取tokens数组中token == “网络” 的数据
cat json1 |jq '.tokens[]|select(.token == "网络")'
返回内容：
{"token": "网络","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0
}
10、添加多个过滤条件：获取tokens数组中token == "网络" and type == "CN_WORD" 的数据
cat json1 |jq '.tokens[]|select(.token == "网络" and .type == "CN_WORD")'
返回内容：
{"token": "网络","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0
}
11、添加过滤条件：获取tokens数组中token == "网络" or token == "法外" 的数据
cat json1 |jq '.tokens[]|select(.token == "网络" or .token == "法外")'
返回内容：
{"token": "网络","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0
}
{"token": "法外","start_offset": 4,"end_offset": 6,"type": "CN_WORD","position": 2
}
12、获取所有数组长度 length函数
cat json1 |jq '.[]|length'
返回内容：
4
13、修改tokens数组中所有token值改为TEST
cat json1 |jq '.tokens|map(.token="TEST")'
返回内容：
[{"token": "TEST","start_offset": 0,"end_offset": 2,"type": "CN_WORD","position": 0},{"token": "TEST","start_offset": 2,"end_offset": 4,"type": "CN_WORD","position": 1},{"token": "TEST","start_offset": 4,"end_offset": 6,"type": "CN_WORD","position": 2},{"token": "TEST","start_offset": 6,"end_offset": 8,"type": "CN_WORD","position": 3}
]
14、转换成字符串，tostring函数
cat json1 | jq '.tokens|tostring'
返回内容：
"[{\"token\":\"网络\",\"start_offset\":0,\"end_offset\":2,\"type\":\"CN_WORD\",\"position\":0},{\"token\":\"不是\",\"start_offset\":2,\"end_offset\":4,\"type\":\"CN_WORD\",\"position\":1},{\"token\":\"法外\",\"start_offset\":4,\"end_offset\":6,\"type\":\"CN_WORD\",\"position\":2},{\"token\":\"之地\",\"start_offset\":6,\"end_offset\":8,\"type\":\"CN_WORD\",\"position\":3}]"
15、if-then-else条件判断语句
判断token值是否=网络，如果满足输出value = 网络，不满足输出value != 网络
cat json1 |jq '.tokens[]|if .token== "网络" then "value = 网络" else "value != 网络" end'
返回内容
"value = 网络"
"value != 网络"
"value != 网络"
"value != 网络"
