# PowerShell

> Markdown source of <https://docs.calebsargeant.com/computing/microsoft/powershell/>.

## For Loop

<https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_foreach?view=powershell-7.2>

``` powershell
$letterArray = "a","b","c","d"
foreach ($letter in $letterArray)
{
  Write-Host $letter
}
```

## Removing Files

<https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/remove-item?view=powershell-7.2>

``` powershell
Remove-Item C:\Test\*.*
```

## Renaming Files

<https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/rename-item?view=powershell-7.2>

``` powershell
Rename-Item -Path "c:\logfiles\daily_file.txt" -NewName "monday_file.txt"
```

## Get Date

<https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/get-date?view=powershell-7.2>

``` powershell
$date = get-date -format yyyymmdd
```

## Send Email

Save the PSCredential in a file:

<https://stackoverflow.com/questions/40029235/save-pscredential-in-the-file>

``` powershell
$credential = Get-Credential
$credential | Export-CliXml -Path 'C:\My\Path\cred.xml'
$credential = Import-CliXml -Path 'C:\My\Path\cred.xml'
```

<https://www.pdq.com/blog/powershell-send-mailmessage-gmail/>

``` powershell
##############################################################################
$From = "YourEmail@gmail.com"
$To = "AnotherEmail@YourDomain.com"
$Cc = "YourBoss@YourDomain.com"
$Attachment = "C:\temp\Some random file.txt"
$Subject = "Email Subject"
$Body = "Insert body text here"
$SMTPServer = "smtp.gmail.com"
$SMTPPort = "587"
Send-MailMessage -From $From -to $To -Cc $Cc -Subject $Subject `
-Body $Body -SmtpServer $SMTPServer -port $SMTPPort -UseSsl `
-Credential (Get-Credential) -Attachments $Attachment
##############################################################################
```

## Random

``` powershell
# If error?
if ($error.count -ne 0) {
    Write-Host -ForegroundColor Red "Uh-oh! $MyVar."
    Write-Host -ForegroundColor White -BackgroundColor Black "The error was:"
    Write-Host $error[0]
    Write-Host -ForegroundColor White -BackgroundColor Black "Oh no!"
    return
}

# Continue past errors
$ErrorActionPreference = 'SilentlyContinue'
```

## Multipart/form-data

<https://get-powershellblog.blogspot.com/2017/09/multipartform-data-support-for-invoke.html>

``` powershell
# Initiate multipartContent
$multipartContent = [System.Net.Http.MultipartFormDataContent]::new()

$stringHeader = [System.Net.Http.Headers.ContentDispositionHeaderValue]::new("form-data")
$stringHeader.Name = "GivenName"
$StringContent = [System.Net.Http.StringContent]::new("Mark")
$StringContent.Headers.ContentDisposition = $stringHeader
$multipartContent.Add($stringContent)

$stringHeader = [System.Net.Http.Headers.ContentDispositionHeaderValue]::new("form-data")
$stringHeader.Name = "Surname"
$StringContent = [System.Net.Http.StringContent]::new("Kraus")
$StringContent.Headers.ContentDisposition = $stringHeader
$multipartContent.Add($stringContent)

$multipartFile = 'C:\pics\profile.png'
$FileStream = [System.IO.FileStream]::new($multipartFile, [System.IO.FileMode]::Open)
$fileHeader = [System.Net.Http.Headers.ContentDispositionHeaderValue]::new("form-data")
$fileHeader.Name = "ProfilePic"
$fileHeader.FileName = 'profile.png'
$fileContent = [System.Net.Http.StreamContent]::new($FileStream)
$fileContent.Headers.ContentDisposition = $fileHeader
$fileContent.Headers.ContentType = [System.Net.Http.Headers.MediaTypeHeaderValue]::Parse("image/png")
$multipartContent.Add($fileContent)

$multipartFile = 'C:\music\LinkinPark_CrawlingInMySkin.midi'
$FileStream = [System.IO.FileStream]::new($multipartFile, [System.IO.FileMode]::Open)
$fileHeader = [System.Net.Http.Headers.ContentDispositionHeaderValue]::new("form-data")
$fileHeader.Name = "BackGroundMusic"
$fileHeader.FileName = 'LinkinPark_CrawlingInMySkin.midi'
$fileContent = [System.Net.Http.StreamContent]::new($FileStream)
$fileContent.Headers.ContentDisposition = $fileHeader
$fileContent.Headers.ContentType = [System.Net.Http.Headers.MediaTypeHeaderValue]::Parse("audio/midi")
$multipartContent.Add($fileContent)

Invoke-RestMethod -Uri $uri -Body $multipartContent -Method 'POST'
```