Download all repositories for a GitHub organization

Download-GitHubRepos.ps1

Function Download-GitHubRepos ([string][parameter(mandatory=$true)] $orgid, [string]$saveLocation)
{
    if (-not ([string]::IsNullOrEmpty($saveLocation)))
    {
        if (-not (Test-Path $saveLocation -PathType Container)) 
        {
            Throw "saveLocation is invalid"
        }
        if (-not ($saveLocation.EndsWith('\')) -or ($saveLocation.EndsWith('/')))
        {
            $saveLocation = $saveLocation + '\'
        }
    }

    $reposUrl = 'https://api.github.com/orgs/' + $orgid + '/repos'
    $repos = Invoke-RestMethod $reposUrl
    foreach ($repo in $repos) 
    {
        $downloadUrl = $repo.html_url + '/archive/master.zip'
        $outputFile = $saveLocation + $repo.name + '.zip'
        Invoke-WebRequest $downloadUrl -OutFile $outputFile
    }
}