PowerShell: Working with Strings and Hashtables

Question

I have this code:

$passwordsParameters = "sysPassword = 12  &&& testPass = 13 &&& systemPassword = 10"

$parametersList = @($passwordsParameters -split '&&&')

$passwordsTable = @{}


ForEach ($parameter in $parametersList) {
    $splitToKeyValue = @($parameter -split '=')
    $passwordsTable += $passwordsTable = @{
        $splitToKeyValue[0].trim() = $splitToKeyValue[1].trim()
    }
}


ForEach ($pass in $passwordsTable.Keys) {
    if ($passwordsTable[$pass] -ne "") {
        Write-Host "set $pass ="$passwordsTable[$pass]"" 
    } else { 
        Write-Host "A value for the parameter $pass was not entered."
    }
}


# Add-Content "d:\myFile.txt" "set $pass ="$passwordsTable[$pass]""

Which perfectly works when I use Write-Host. But I want to do something like in the comment in line 25. I tried several ways but I always got a static string instead of the values that I get from the Hashtable.

At the end I want to have something like:

set pass1 = 12
set pass2 = 5

in myFile.txt

Any help is appreciated. Thanks!

lww · Accepted Answer · 2020-11-18 14:50:07Z

0

You could change Write-Host (just prints to a console) to Write-Output ( which passes an object to a pipeline). Write-Output does not print to the console.

$passwordsParameters = "sysPassword = 12  &&& testPass = 13 &&& systemPassword = 10"
$parametersList = @($passwordsParameters -split '&&&')
$passwordsTable = @{}


ForEach ($parameter in $parametersList) {
    $splitToKeyValue = @($parameter -split '=')
    $passwordsTable += $passwordsTable = @{
        $splitToKeyValue[0].trim() = $splitToKeyValue[1].trim()
    }
}

$counter=0
ForEach ($pass in $passwordsTable.Keys) {
    if ($passwordsTable[$pass] -ne "") {
        $counter++
        Write-Output "set "pass$counter = $passwordsTable[$pass]"`n"  | Add-Content -NoNewline myFile.txt 
    } else { 
        Write-Host "A value for the parameter $pass was not entered."
    }
}

Output:

set pass1=10
set pass2=13
set pass3=12

edited Nov 18, 2020 at 14:50

answered Nov 18, 2020 at 14:39

lww

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Comments

Theo · Accepted Answer · 2020-11-18 15:20:04Z

0

You can replace the first foreach loop if you simply replace all the &&& by a newline and use cmdlet ConvertFrom-StringData.

Add-Content also has a switch called -PassThru that will let you write to the file and also output to console.

$passwordsParameters = "sysPassword = 12  &&& testPass = 13 &&& systemPassword = 10"

$passwordsTable = $passwordsParameters -replace '&&&', [Environment]::NewLine | ConvertFrom-StringData

foreach ($pass in $passwordsTable.Keys) {
    if ($passwordsTable[$pass]) {
        $msg = 'set {0} = {1}' -f $pass, $passwordsTable[$pass]
        # or use: $msg = "set $pass = $($passwordsTable[$pass])" 

        # write this to the file. switch -PassThru will also output to the console
        Add-Content -Path 'D:\myFile.txt' -Value $msg -PassThru
    } else { 
        Write-Host "A value for the parameter '$pass' was not entered."
    }
}

answered Nov 18, 2020 at 15:20

Theo

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1 Comment

user11856923 Over a year ago

Thanks for replying. Could you please explain this line to me: $msg = 'set {0} = {1}' -f $pass, $passwordsTable[$pass] Thank you!

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