List all TFS built-in variables for Team Foundation Build (vNext) using PowerShell script

TFSBuildVarsDebug.ps1

Write-Host "SYSTEM_TEAMPROJECT: $ENV:SYSTEM_TEAMPROJECT"
Write-Host "SYSTEM_TEAMFOUNDATIONSERVERURI: $ENV:SYSTEM_TEAMFOUNDATIONSERVERURI"
Write-Host "SYSTEM_TEAMFOUNDATIONCOLLECTIONURI: $ENV:SYSTEM_TEAMFOUNDATIONCOLLECTIONURI"
Write-Host "SYSTEM_COLLECTIONID: $ENV:SYSTEM_COLLECTIONID"
Write-Host "SYSTEM_DEFAULTWORKINGDIRECTORY: $ENV:SYSTEM_DEFAULTWORKINGDIRECTORY"
Write-Host "BUILD_DEFINITIONNAME: $ENV:BUILD_DEFINITIONNAME"
Write-Host "BUILD_DEFINITIONVERSION: $ENV:BUILD_DEFINITIONVERSION"
Write-Host "BUILD_BUILDNUMBER: $ENV:BUILD_BUILDNUMBER"
Write-Host "BUILD_BUILDURI: $ENV:BUILD_BUILDURI"
Write-Host "BUILD_BUILDID: $ENV:BUILD_BUILDID"
Write-Host "BUILD_QUEUEDBY: $ENV:BUILD_QUEUEDBY"
Write-Host "BUILD_QUEUEDBYID: $ENV:BUILD_QUEUEDBYID"
Write-Host "BUILD_REQUESTEDFOR: $ENV:BUILD_REQUESTEDFOR"
Write-Host "BUILD_REQUESTEDFORID: $ENV:BUILD_REQUESTEDFORID"
Write-Host "BUILD_SOURCEVERSION: $ENV:BUILD_SOURCEVERSION"
Write-Host "BUILD_SOURCEBRANCH: $ENV:BUILD_SOURCEBRANCH"
Write-Host "BUILD_SOURCEBRANCHNAME: $ENV:BUILD_SOURCEBRANCHNAME"
Write-Host "BUILD_REPOSITORY_NAME: $ENV:BUILD_REPOSITORY_NAME"
Write-Host "BUILD_REPOSITORY_PROVIDER: $ENV:BUILD_REPOSITORY_PROVIDER"
Write-Host "BUILD_REPOSITORY_CLEAN: $ENV:BUILD_REPOSITORY_CLEAN"
Write-Host "BUILD_REPOSITORY_URI: $ENV:BUILD_REPOSITORY_URI"
Write-Host "BUILD_REPOSITORY_TFVC_WORKSPACE: $ENV:BUILD_REPOSITORY_TFVC_WORKSPACE"
Write-Host "BUILD_REPOSITORY_TFVC_SHELVESET: $ENV:BUILD_REPOSITORY_TFVC_SHELVESET"
Write-Host "BUILD_REPOSITORY_GIT_SUBMODULECHECKOUT: $ENV:BUILD_REPOSITORY_GIT_SUBMODULECHECKOUT"
Write-Host "AGENT_NAME: $ENV:AGENT_NAME"
Write-Host "AGENT_ID: $ENV:AGENT_ID"
Write-Host "AGENT_HOMEDIRECTORY: $ENV:AGENT_HOMEDIRECTORY"
Write-Host "AGENT_ROOTDIRECTORY: $ENV:AGENT_ROOTDIRECTORY"
Write-Host "AGENT_WorkFolder: $ENV:AGENT_WorkFolder"
Write-Host "BUILD_REPOSITORY_LOCALPATH: $ENV:BUILD_REPOSITORY_LOCALPATH"
Write-Host "BUILD_SOURCESDIRECTORY: $ENV:BUILD_SOURCESDIRECTORY"
Write-Host "BUILD_ARTIFACTSTAGINGDIRECTORY: $ENV:BUILD_ARTIFACTSTAGINGDIRECTORY"
Write-Host "BUILD_STAGINGDIRECTORY: $ENV:BUILD_STAGINGDIRECTORY"
Write-Host "AGENT_BUILDDIRECTORY: $ENV:AGENT_BUILDDIRECTORY"

$nl = [System.Environment]::NewLine
$date = Get-Date
$data = ("Script executed on " + $Date.ToString("yyyy-MM-dd hh:mm:ss tt") + $nl)

$data = $data + $nl + "SYSTEM_TEAMPROJECT: $ENV:SYSTEM_TEAMPROJECT"
$data = $data + $nl + "SYSTEM_TEAMFOUNDATIONSERVERURI: $ENV:SYSTEM_TEAMFOUNDATIONSERVERURI"
$data = $data + $nl + "SYSTEM_TEAMFOUNDATIONCOLLECTIONURI: $ENV:SYSTEM_TEAMFOUNDATIONCOLLECTIONURI"
$data = $data + $nl + "SYSTEM_COLLECTIONID: $ENV:SYSTEM_COLLECTIONID"
$data = $data + $nl + "SYSTEM_DEFAULTWORKINGDIRECTORY: $ENV:SYSTEM_DEFAULTWORKINGDIRECTORY"
$data = $data + $nl + "BUILD_DEFINITIONNAME: $ENV:BUILD_DEFINITIONNAME"
$data = $data + $nl + "BUILD_DEFINITIONVERSION: $ENV:BUILD_DEFINITIONVERSION"
$data = $data + $nl + "BUILD_BUILDNUMBER: $ENV:BUILD_BUILDNUMBER"
$data = $data + $nl + "BUILD_BUILDURI: $ENV:BUILD_BUILDURI"
$data = $data + $nl + "BUILD_BUILDID: $ENV:BUILD_BUILDID"
$data = $data + $nl + "BUILD_QUEUEDBY: $ENV:BUILD_QUEUEDBY"
$data = $data + $nl + "BUILD_QUEUEDBYID: $ENV:BUILD_QUEUEDBYID"
$data = $data + $nl + "BUILD_REQUESTEDFOR: $ENV:BUILD_REQUESTEDFOR"
$data = $data + $nl + "BUILD_REQUESTEDFORID: $ENV:BUILD_REQUESTEDFORID"
$data = $data + $nl + "BUILD_SOURCEVERSION: $ENV:BUILD_SOURCEVERSION"
$data = $data + $nl + "BUILD_SOURCEBRANCH: $ENV:BUILD_SOURCEBRANCH"
$data = $data + $nl + "BUILD_SOURCEBRANCHNAME: $ENV:BUILD_SOURCEBRANCHNAME"
$data = $data + $nl + "BUILD_REPOSITORY_NAME: $ENV:BUILD_REPOSITORY_NAME"
$data = $data + $nl + "BUILD_REPOSITORY_PROVIDER: $ENV:BUILD_REPOSITORY_PROVIDER"
$data = $data + $nl + "BUILD_REPOSITORY_CLEAN: $ENV:BUILD_REPOSITORY_CLEAN"
$data = $data + $nl + "BUILD_REPOSITORY_URI: $ENV:BUILD_REPOSITORY_URI"
$data = $data + $nl + "BUILD_REPOSITORY_TFVC_WORKSPACE: $ENV:BUILD_REPOSITORY_TFVC_WORKSPACE"
$data = $data + $nl + "BUILD_REPOSITORY_TFVC_SHELVESET: $ENV:BUILD_REPOSITORY_TFVC_SHELVESET"
$data = $data + $nl + "BUILD_REPOSITORY_GIT_SUBMODULECHECKOUT: $ENV:BUILD_REPOSITORY_GIT_SUBMODULECHECKOUT"
$data = $data + $nl + "AGENT_NAME: $ENV:AGENT_NAME"
$data = $data + $nl + "AGENT_ID: $ENV:AGENT_ID"
$data = $data + $nl + "AGENT_HOMEDIRECTORY: $ENV:AGENT_HOMEDIRECTORY"
$data = $data + $nl + "AGENT_ROOTDIRECTORY: $ENV:AGENT_ROOTDIRECTORY"
$data = $data + $nl + "AGENT_WorkFolder: $ENV:AGENT_WorkFolder"
$data = $data + $nl + "BUILD_REPOSITORY_LOCALPATH: $ENV:BUILD_REPOSITORY_LOCALPATH"
$data = $data + $nl + "BUILD_SOURCESDIRECTORY: $ENV:BUILD_SOURCESDIRECTORY"
$data = $data + $nl + "BUILD_ARTIFACTSTAGINGDIRECTORY: $ENV:BUILD_ARTIFACTSTAGINGDIRECTORY"
$data = $data + $nl + "BUILD_STAGINGDIRECTORY: $ENV:BUILD_STAGINGDIRECTORY"
$data = $data + $nl + "AGENT_BUILDDIRECTORY: $ENV:AGENT_BUILDDIRECTORY"

$scriptDir = Split-Path -Path $MyInvocation.MyCommand.Definition -Parent
$data | Out-File ($scriptDir + "\TFSBuildDebug.log")