将bash数组转换为json数组并使用jq插入文件 [英] Convert bash array to json array and insert to file using jq

问题描述

给出一个bash数组，如何将其转换为JSON数组以便使用jq输出到文件?

Given a bash array, how to convert it to a JSON array in order to output to a file with jq?

另外:是否有一种方法可以使server_nohup数组保持不变，而不是每次都重写整个json文件?

Additionnally: is there a way to keep the server_nohup array unchanged instead of re-writing the whole json file each time?

newArray=(100 200 300)
jq -n --arg newArray $newArray '{
    client_nohup: [ 
        $newArray
    ],
    server_nohup: [

    ]
}' > $projectDir/.watch.json

当前输出:

{
"client_nohup": [
    "100"
],
"server_nohup": []
}

所需的输出:

{
"client_nohup": [
    100,
    200,
    300
],
"server_nohup": []
}

推荐答案

(1)如果newArray中的所有值都是有效的JSON值且没有空格，那么您就可以将这些值作为流进行管道传输，例如

(1) If all the values in newArray are valid as JSON values without spaces, then you could get away with piping the values as a stream, e.g.

newArray=(100 200 300)
echo "${newArray[@]}" |
  jq -s '{client_nohup: ., server_nohup: []}'

(2) 现在，假设您只希望更新文件中的"nohup"对象，例如nohup.json:

(2) Now let's suppose you merely wish to update the "nohup" object in a file, say nohup.json:

{ "client_nohup": [], "server_nohup": [ "keep me" ] }

由于您正在使用bash，因此可以编写:

Since you are using bash, you can then write:

echo "${newArray[@]}" |
  jq -s --argjson nohup "$(cat nohup.json)" '
    . as $newArray | $nohup | .client_nohup = $newArray
  '

输出

(1)

{
  "client_nohup": [
    100,
    200,
    300
   ],
  "server_nohup": []
}

(2)

{
  "client_nohup": [
    100,
    200,
    300
  ],
  "server_nohup": [
    "keep me"
  ]
}

其他情况

有志者事竟成，:-)

Other cases

Where there's a will, there's a jq way :-)

例如，在>如何将bash数组格式化为JSON数组(尽管这不是一个完全通用的解决方案).

See for example the accepted answer at How to format a bash array as a JSON array (though this is not a completely generic solution).

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