Install kubectl mutli platform

install-kubectl-multiplatform.ps1

#!/usr/bin/pwsh
function Get-KubectlUnix {
    param (
        [string]$Version,
        [string]$Platform
    )

    $tempPath = [System.IO.Path]::GetTempFileName()
    $kubectlURL = "https://storage.googleapis.com/kubernetes-release/release/$($Version.Trim("`n"))/bin/$Platform/amd64/kubectl"

    Write-Host "Downloading kubectl to $tempPath"
    (New-Object System.Net.WebClient).DownloadFile($kubectlURL, $tempPath)
    chmod +x $tempPath
    sudo mv $tempPath /usr/local/bin/kubectl
    if (-Not $?) {
        exit 1
    } 
}

function Install-Kubectl {
    $latestKubernetesVersion = Invoke-WebRequest 'https://storage.googleapis.com/kubernetes-release/release/stable.txt' `
        | Select-Object -ExpandProperty Content

    if ($IsLinux) {
        Get-KubectlUnix -Version $latestKubernetesVersion -Platform linux
    }
    elseif ($IsMacOS) {
        Get-KubectlUnix -Version $latestKubernetesVersion -Platform darwin
    }
    else {
        if (Test-CommandExists choco) {
            choco install kubernetes-cli
        }
        else {
            Install-Script -Name install-kubectl -Scope CurrentUser -Force
            install-kubectl.ps1
        }
    }
}

# Source: https://blogs.technet.microsoft.com/heyscriptingguy/2013/02/19/use-a-powershell-function-to-see-if-a-command-exists/
function Test-CommandExists
{
    Param ([string]$command)
    $oldPreference = $ErrorActionPreference
    $ErrorActionPreference = 'stop'

    try {
        if(Get-Command $command) {
            return $true
        }
    }
    Catch {
        return $false
    }
    Finally {
        $ErrorActionPreference = $oldPreference
    }
}

# Install Kubectl depending on platform
if (-Not (Test-CommandExists kubectl)) {
    Install-Kubectl
    Write-Host "Kubectl installed!"
}