Question

我正在尝试使用powershell从我的JSON输出中移除最后一个，我是Linux管理员，我会使用sed或awk来做到这一点，但我想知道如何使用PowerShell完成相同的任务。

{
    "data": [
        {
            "{#SERVICESTATE}": "Stopped",
            "{#SERVICEDISPLAY}": "Application Experience",
            "{#SERVICENAME}": "AeLookupSvc"
        },
       {
         "{#SERVICESTATE}": "Stopped",
         "{#SERVICEDISPLAY}": "Application Layer Gateway Service",
         "{#SERVICENAME}": "ALG"
    },  <--------- This is the comma I would like to remove from my output ---->
    ]
}

Answer 1

将-replace与多行正则表达式一起使用：

$JSON_Text = 
@'
{
    "data": [
        {
            "{#SERVICESTATE}": "Stopped",
            "{#SERVICEDISPLAY}": "Application Experience",
            "{#SERVICENAME}": "AeLookupSvc"
        },
       {
         "{#SERVICESTATE}": "Stopped",
         "{#SERVICEDISPLAY}": "Application Layer Gateway Service",
         "{#SERVICENAME}": "ALG"
    },  <--------- This is the comma I would like to remove from my output ---->
]


}
'@

$JSON_Text -replace '(?ms)(.+)(},)(.+)','$1}$3' 



{
    "data": [
        {
            "{#SERVICESTATE}": "Stopped",
            "{#SERVICEDISPLAY}": "Application Experience",
            "{#SERVICENAME}": "AeLookupSvc"
        },
       {
         "{#SERVICESTATE}": "Stopped",
         "{#SERVICEDISPLAY}": "Application Layer Gateway Service",
         "{#SERVICENAME}": "ALG"
    }  <--------- This is the comma I would like to remove from my output ---->
]


}

第一次捕获是＆＃34;贪婪＆＃34;，所以它会直接跑过第一个}，然后停在最后一个。

Answer 2

使用Get-Content（别名GC）加载文件，从最后开始，逐行退回查找逗号，并将其替换为找不到的内容。然后再次输出文件。

$file = gc c:\temp\test.txt
for($i = $file.count;$i -ge 0;$i--){if($file[$i] -match ","){$file[$i] = $file[$i] -replace ",";break}}
$file|out-file c:\temp\test.txt -force

从最后一行删除逗号

2 个答案: