使用 Shell 脚本解析 JSON 数据答案

【问题标题】：Parse JSON Data using Shell Scripting使用 Shell 脚本解析 JSON 数据
【发布时间】：2016-12-06 07:20:15
【问题描述】：

如何使用 shell 脚本从以下 json 数据中解析字符串 'key' 的值？

/Users/local/Documents/testjira:{"expand":"schema","names","startAt":"0","maxResults":"50","total":"2","issues":[{"expand":"operations","editmeta","changelog","transitions","renderedFields","id":"56392","self":"https://website.com/jira/rest/api/latest/issue/50342","key":"SAR-32"},{"expand":"operations","editmeta","changelog","transitions","renderedFields","id":"49799","self":"https://website.com/jira/rest/api/latest/issue/19720","key":"SAR-5"}]}

示例输出： SAR-32、SAR-5 等等..

【问题讨论】：

使用合适的json解析工具，比如jq

标签： bash shell sh

【解决方案1】：

假设像这样的有效 JSON

{
    "expand":["schema", "names"],
    "startAt":"0",
    "maxResults":"50",
    "total":"2",
    "issues":[
        {
            "expand":["operations","editmeta","changelog","transitions","renderedFields"],
            "id":"56392",
            "self":"https://website.com/jira/rest/api/latest/issue/50342",
            "key":"SAR-32"
        },
        {
            "expand":["operations","editmeta","changelog","transitions","renderedFields"],
            "id":"49799",
            "self":"https://website.com/jira/rest/api/latest/issue/19720",
            "key":"SAR-5"
        }
    ]
}

您可以使用以下呼叫jq：

$ jq -r '.issues[] | .key' tmp.json
SAR-32
SAR-5

【讨论】：

【解决方案2】：

您可以使用grep 和cut 轻松做到这一点：

[ttucker@localhost ~]$ cat /tmp/testjira2
{"expand":"schema","names","startAt":"0","maxResults":"50","total":"2","issues":[{"expand":"operations","editmeta","changelog","transitions","renderedFields","id":"56392","self":"https://website.com/jira/rest/api/latest/issue/50342","key":"SAR-32"},{"expand":"operations","editmeta","changelog","transitions","renderedFields","id":"49799","self":"https://website.com/jira/rest/api/latest/issue/19720","key":"SAR-5"}]}

[ttucker@localhost ~]$ grep -o '"key":"[^"]*"' /tmp/testjira2 |cut -d'"' -f4
SAR-32
SAR-5

【讨论】：

我使用了上面的命令，但没有显示任何输出。我使用的命令 "grep -o 'key:[-A-Z0-9]*' /Users/local/Documents/jira | cut -d: -f2"
您使用的是哪个版本的grep？ grep -V另外，您确定您的数据与您的样本数据匹配吗？
是的，我确信数据是一样的。 grep 版本 -- 'grep (GNU grep) 2.20'
应该没问题。如果您将测试数据放入文件中，然后在其上运行命令，它会返回结果吗？另外，它必须是bash吗？由于它是 JSON，您可以轻松地使用 Perl 或 PHP 或其他东西加载它...
对不起，我已经再次验证了数据。

【解决方案3】：

可以将nodejs 与Here Documents 一起使用，例如：

alec@mba ~/project/lnet (master) $ cat /Users/alec/project/lnet/test/rc/05\ Two\ hubs.json
{
  "desc": "This is a configuration file to run the test on all the hubs and leaves that can possibly participate",
  "hubs": { "hub0": "176.37.63.2", "hub1": "10.0.0.10" }
}
alec@mba ~/project/lnet (master) $ runAll() {
>   local conf="$HOME/project/lnet/$1"
>   echo "runAll: using configuration file $conf"
>   local output=$(node <<-EOF_JS
>     const conf = require("$conf")
>     console.log('hub0="' + conf.hubs.hub0 + '"')
> EOF_JS
> )
>   eval "$output"; echo "$hub0"
> }
alec@mba ~/project/lnet (master) $ runAll test/rc/05\ Two\ hubs.json
runAll: using configuration file /Users/alec/project/lnet/test/rc/05 Two hubs.json
176.37.63.2
alec@mba ~/project/lnet (master) $

【讨论】：