Replace a value in a json using powershell

问题

I have a json file with the following content -

{
"IsEnabled": true,
"EngineConfiguration": {
    "PollInterval": "00:00:15",
    "Components": [{
        "Id": "Logs",
        "FullName": "AWS.EC2.Windows.CloudWatch.CustomLog.CustomLogInputComponent,AWS.EC2.Windows.CloudWatch",
        "Parameters": {
            "LogDirectoryPath": "C:\\log\\2018-05-25",
            "TimestampFormat": "yyyy-MM-dd HH:mm:ss",
            "Encoding": "UTF-8",
            "Filter": "",
            "CultureName": "en-US",
            "TimeZoneKind": "UTC",
            "LineCount": "1"
        }
    }]
  }
}

I want to replace this date(mentioned in LogDirectoryPath) everyday using a managed task using powershell.

Can someone please give the easiest way to replace this everyday using powershell?

回答1:

This script will help you to update log directory.

Steps:

1. Get content of json file.
2. Update attribute value if exists. $JsonData.update | % {if(...)
3. Save content in same file.

Script:

$JsonData = Get-Content $JsonFilePath -raw | ConvertFrom-Json

$JsonData.update | % { if($JsonData.engineconfiguration.Components.Parameters.LogDirectoryPath)
                            {
                                $JsonData.engineconfiguration.Components.Parameters.LogDirectoryPath = "C:\log\$(Get-Date -Format 'yyyy-MM-dd')"
                            }
                        }

$JsonData | ConvertTo-Json -Depth 4  | set-content $JsonFilePath 

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来源：https://stackoverflow.com/questions/50521035/replace-a-value-in-a-json-using-powershell