如何删除Powershell中的前导和尾随空格？

Question

Where I run the following command:

Write-Host '"os":"'(Get-CimInstance -ClassName CIM_OperatingSystem).Caption'",'

I get the following output:

"os":" Microsoft Windows 10 Pro ",

How to remove the leading and trailing space in the output??

Answer 1

This is because you're passing 3 distinct string arguments to Write-Host , the cmdlet then separates them with spaces:

Write-Host '"os":"'(Get-CimInstance -ClassName CIM_OperatingSystem).Caption'",'
           \______/\______________________________________________________/\__/

Change to

Write-Host """os"":""$((Get-CimInstance -ClassName CIM_OperatingSystem).Caption)"","

Here, we create 1 (one!) string with correctly escaped quotation marks, and Write-Host won't attempt to add any whitespace.

---

If the goal is to produce JSON, I'd suggest constructing a new object and letting ConvertTo-Json take care of the rest:

$data = [pscustomobject]@{
  os = (Get-CimInstance -ClassName CIM_OperatingSystem).Caption
}

$data |ConvertTo-Json

The output of which will be something like:

{
    "os":  "Microsoft Windows 10 Enterprise"
}