Determine installed PowerShell version

Question

How can I determine what version of PowerShell is installed on a computer, and indeed if it is installed at all?

Answer 1

Since the most helpful answer didn't address the if exists portion, I thought I'd give one take on it via a quick-and-dirty solution. It relies on PowerShell being in the path environment variable which is likely what you want. (Hat tip to the top answer as I didn't know that.) Paste this into a text file and name it

Test Powershell Version.cmd

or similar.

@echo off
echo Checking powershell version...
del "%temp%\PSVers.txt" 2>nul
powershell -command "[string]$PSVersionTable.PSVersion.Major +'.'+ [string]$PSVersionTable.PSVersion.Minor | Out-File ([string](cat env:\temp) + '\PSVers.txt')" 2>nul
if errorlevel 1 (
 echo Powershell is not installed. Please install it from download.Microsoft.com; thanks.
) else (
 echo You have installed Powershell version:
 type "%temp%\PSVers.txt"
 del "%temp%\PSVers.txt" 2>nul
)
timeout 15