如何使用shell脚本将json对象添加到json文件

Question

json文件如下:

{"name" :"sam",
"age":23,
"designation":"doctor"}

现在我想使用bash脚本在文件末尾添加另一个json对象{"location":"canada"}我已经尝试了echo"{"location":"canada"}">> sample.json

但结果

{"name" :"sam",
"age":23,
"designation":"doctor"} {location:canada}

但我希望它像这样

{"name" :"sam",
"age":23,
"designation":"doctor", 
"location":"canada"}

请建议我

Answer 1

要合并两个json对象,可以使用jq命令行实用程序:

$ jq -s add sample.json another.json

输出:

{
  "name": "sam",
  "age": 23,
  "designation": "doctor",
  "location": "canada"
}

要更新单个属性:

$ jq '.location="canada"' sample.json

它产生相同的输出.

要预先添加"doctor"到位置:

$ jq '.location = "doctor" + .location' input.json

输出:

{
  "name": "sam",
  "age": 23,
  "designation": "doctor",
  "location": "doctorcanada"
}

Answer 2

sed -i '$s/}/,\n"location":"canada"}/' sample.json

结果:

{"name" :"sam",
"age":23,
"designation":"doctor",
"location":"canada"}