如何将读取值变量附加到其中带有双引号的文件中 [英] how to append a read value variable to a file which has double quotes in it

问题描述

我想将变量写入JSON文件.

I would like to write a variable to a JSON file.

我尝试了许多sed命令，但仍然找不到解决方法

I have tried many sed commands but still cant find a solution

#! bin/bash   

echo "Hello"
echo "lets create an instance"

read -p "please enter the type of instance you need: " instance_type

echo $instance_type | sed -i "s|""InstanceType"": """"|""InstanceType"": 
""${instance_type}""|g" awsspotinstancecreation.json

roxor@ubuntu:~$ bash rough.sh

Hello

lets create an instance

please enter the type of instance you need: t2.small

{
      "ImageId": "ami-074acc26872f26463",

      "KeyName": "Accesskeypair",

      "SecurityGroupIds": ["sg-064caf9c470e4e8e6"],

      **##"InstanceType": "${instance_type}",##**

      "Placement": {
        "AvailabilityZone": "us-east-1a"
      }
}

推荐答案

您的 sed 存在引用问题以及试图同时从文件和STDIN读取数据的问题.

Your sed has quoting issues as well as the problem of trying to read data from file and STDIN simultaneously.

使用面向行的工具(例如 sed ， grep 和 awk )来解析或修改JSON通常是一个坏主意.最好的基于shell的工具是 jq .

It's generally a bad idea to use line-oriented tools like sed, grep, and awk to parse or modify JSON. The best shell-based tool for this task is jq.

jq 1.5 +:

read -p "Instance type: " instance
export instance
jq '.InstanceType=env.instance' awsspotinstancecreation.json

jq 1.4 +:

read -p "Instance type: " instance
jq --arg instance "$instance" '.InstanceType=$instance' awsspotinstancecreation.json

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