linux - 循环 json 文件/数组 linux bash

Question

我有一个如下所示的 json 文件:

{"data":{"players":[{"id":"aaaa","is_multiple":false,"name":"TV Woonkamer","password_protected":false,"support_seek":false,"support_set_volume":false,"type":"upnp"},{"id":"bbbb","is_multiple":false,"name":"squeezelite","password_protected":false,"support_seek":true,"support_set_volume":true,"type":"upnp"},{"id":"cccc","is_multiple":false,"name":"Woonkamer","password_protected":false,"support_seek":true,"support_set_volume":true,"type":"airplay"},{"id":"__dddd__","is_multiple":true,"name":"Multiple AirPlay Devices","password_protected":false,"support_seek":true,"support_set_volume":true,"type":"airplay"}]},"success":true}

由 PHP 解析:

stdClass Object
(
[data] => stdClass Object
    (
        [players] => Array
            (
                [0] => stdClass Object
                    (
                        [id] => uuid:aaaa
                        [is_multiple] => 
                        [name] => TV Woonkamer
                        [password_protected] => 
                        [support_seek] => 
                        [support_set_volume] => 
                        [type] => upnp
                    )

                [1] => stdClass Object
                    (
                        [id] => uuid:bbbb
                        [is_multiple] => 
                        [name] => squeezelite
                        [password_protected] => 
                        [support_seek] => 1
                        [support_set_volume] => 1
                        [type] => upnp
                    )

                [2] => stdClass Object
                    (
                        [id] => cccc
                        [is_multiple] => 
                        [name] => Woonkamer
                        [password_protected] => 
                        [support_seek] => 1
                        [support_set_volume] => 1
                        [type] => airplay
                    )

                [3] => stdClass Object
                    (
                        [id] => __dddd__
                        [is_multiple] => 1
                        [name] => Multiple AirPlay Devices
                        [password_protected] => 
                        [support_seek] => 1
                        [support_set_volume] => 1
                        [type] => airplay
                    )

            )

    )

[success] => 1
)

我想从 linux 命令行循环遍历它，找到 is_multiple 为空且类型为 airplay 的所有播放器 ID。下面显示了所有类型为airplay的播放器列表，但是如何开始循环？

jq '.data .players[]' scan.json | jq 'select(.type=="airplay")' | jq -r '.id'

Answer 1

我相信你之后的代码是这样的

<scan.json jq -r '.data.players[]|select(.type == "airplay" and .is_multiple == false)|.id' |
   xargs -I{} wget -q "https://my.web/?id={}"

如果对每个 id 的操作更复杂，您可以将其包装在 .sh 脚本中，或在 bash 函数中(如 process_one_id( ){ 命令.. ;}.

注意:要将 bash 函数与 xargs 一起使用，您必须执行 export -f process_one_id 然后通过 bash 调用它，如 xargs -I {} bash -c process_one_id {}。或者使用 GNU parallel 这使得调用导出的 shell 函数变得透明。