Rename Student Names to IDs

gistfile1.ps1

Function Create-HashTable { 
    param ($filePath)
    $mytable = Import-Csv -Path $filePath
    $HashTable=@{}
    foreach($r in $mytable)
    {
        $HashTable[$r.Name] = $r.ID
    }
    return $HashTable 
}

$Dir = "C:\temp\Strickland"
$CSVFile = "C:\temp\strickland\input.csv"

$Items = Get-ChildItem -Path $dir -Filter *.jpg

$Lookup = Create-HashTable -filePath $CSVFile

foreach ($item in $items) { 
    [string]$BaseName = $item.BaseName
    $Number = $BaseName.Substring($BaseName.Length - 1, 1)
    $BaseName = $BaseName.Substring(0, $BaseName.Length - 1)
    $NewName = "$($Lookup[$BaseName])-$number.jpg"
    # Changed to Rename-Item (from Move-Item) 
    # Thanks to a tip from Terry Orsm Wrennall
    rename-item -Path $item.FullName -NewName "$NewName" -WhatIf
}