What’s in your PowerShell $PSDefaultParameterValues Preference Variable?

The $PSDefaultParameterValues preference variable, which was introduced in Windows PowerShell version 3.0, provides a mechanism for specifying default values for parameters. I thought I would share what I’ve added to mine and ask the community to share theirs. $PSDefaultParameterValues = @{ 'Out-Default:OutVariable' = 'LastResult' 'Out-File:Encoding' = 'utf8' 'Export-Csv:NoTypeInformation' = $true 'ConvertTo-Csv:NoTypeInformation' = $true 'Receive-Job:Keep' = $true 'Install-Module:AllowClobber' = $true 'Install-Module:Force' = $true 'Install-Module:SkipPublisherCheck' = $true } The first one in the list ('Out-Default:OutVariable' = 'LastResult') is one I picked up from Joel Bennett to store the results of the last command in a variable named $LastResult....

August 1, 2019 · 2 min · 425 words · Mike F. Robbins

Install PowerShell 7 with Jeff Hicks’ PSReleaseTools Module

PowerShell version 7 is currently in preview and while it can be installed on Windows, Linux, and macOS, the examples shown in this blog article focus on installing it on a Windows based system, specifically Windows 10 using Windows PowerShell version 5 or higher which ships by default with Windows 10. Your mileage may vary with other operating systems, other versions of Windows, and/or other versions of Windows PowerShell. The easiest way that I’ve found to install the preview of PowerShell version 7 is to first install Jeff Hicks' PSReleaseTools PowerShell module from the PowerShell Gallery using Windows PowerShell....

July 11, 2019 · 2 min · 235 words · Mike F. Robbins

Import a Hyper-V Virtual Machine with PowerShell

I recently ran into a problem where an exported VM from Windows Server 2016 running Hyper-V wasn’t able to be imported on Windows Server 2019 running Hyper-V. When attempting to perform the import, the GUI stated “No virtual machines files found” as shown in the following image. This problem may have been due to using Hyper-V manager on a remote system running Windows Server 2012 R2, although the same system was used for the export....

July 10, 2019 · 2 min · 267 words · Mike F. Robbins

Determine the Generation of a Hyper-V VM with PowerShell

Ever need to determine what generation all of the virtual machines are on your Hyper-V servers? This is simple using the Get-VM command that installs as part of the Hyper-V module for Windows PowerShell. Get-WindowsOptionalFeature -FeatureName *hyper*powershell -Online While the previous command will work on both clients and servers, the following command could also be used on a Windows server. Get-WindowsFeature -Name *hyper*powershell The generation of the VM is one of the properties from the results of Get-VM....

June 28, 2019 · 1 min · 153 words · Mike F. Robbins

Mitigating BlueKeep with PowerShell

When it comes to security, most people normally approach it at one extreme or the other. Some people do nothing and don’t worry about it. All I can say for those folks is good luck with that and I hope your resume is updated. Others go into full blown panic mode, especially those who don’t take the time to understand vulnerabilities. Many security folks and articles on the Internet don’t help much either because they often blow things out of proportion which puts many of the people in the second category into panic mode....

June 14, 2019 · 4 min · 852 words · Mike F. Robbins

Find an Application that runs as a Service in your Environment with PowerShell

I recently worked with a vendor to remove an old application that was no longer being used from a server in one of my customer’s environments. While many applications may be left to die on the server long after they’re needed, this particular one transmitted data to a partner company so it definitely needed to be removed. The problem is the application was so old that no one knew which server of the hundreds of servers it was running on....

May 31, 2019 · 3 min · 517 words · Mike F. Robbins

Video: Finding Performance Bottlenecks of Windows Based Systems with PowerShell

Earlier this month, I presented a session on Finding Performance Bottlenecks with PowerShell at the PowerShell + DevOps Global Summit 2019 in Bellevue, Washington. The session seemed to be well received by the audience based on the feedback that I received from the attendees. The video from this presentation is now available. The code and slides used during the demonstration can be found in my presentations repository on GitHub. µ

May 23, 2019 · 1 min · 70 words · Mike F. Robbins

Using the AST to Find Module Dependencies in PowerShell Functions and Scripts

Earlier this week, Chris Gardner presented a session on Managing dependencies in PowerShell for the Mississippi PowerShell User Group. I mentioned that I had written a function to retrieve PowerShell module dependencies that’s part of my ModuleBuildTools module. Get-MrAST is one of the primary functions that numerous other functions in the module are built on. #Requires -Version 3.0 function Get-MrAst { <# .SYNOPSIS Explores the Abstract Syntax Tree (AST). .DESCRIPTION Get-MrAST is an advanced function that provides a mechanism for exploring the Abstract Syntax Tree (AST)....

May 17, 2019 · 6 min · 1262 words · Mike F. Robbins

Sort PowerShell Results in both Ascending and Descending Order

A few weeks ago I was trying to figure out how to sort something in PowerShell with one property sorted descending and another one ascending. How to accomplish this was hiding in plain sight in the help examples for Sort-Object, but I thought I would documented it here for future reference. Use the Property parameter with a hash table to specify the property names and their sort orders. Get-Service -Name Win* | Sort-Object -Property @{ expression = 'Status' descending = $true }, @{ expression = 'DisplayName' descending = $false } This same command can be written on one line....

May 9, 2019 · 1 min · 188 words · Mike F. Robbins

Use PowerShell to Identify the Process ID for SQL Server Services

I recently saw a blog article on How to Identify Process ID for SQL Server Services? – Interview Question of the Week #185 written by Pinal Dave. While his answer is simple with TSQL, what if you’re not a SQL guy? You can also retrieve this information with PowerShell from Windows itself. When it comes to retrieving information about Windows services with PowerShell, the first command that comes to mind is Get-Service....

April 25, 2019 · 2 min · 261 words · Mike F. Robbins

Enable Tab Completion in VSCode for a PowerShell ISE like Experience

I’m using VSCode for all of my PowerShell development at this point. I reloaded my system from scratch on March 13th of this year. Yesterday was the first time I’ve opened the PowerShell ISE since then and it was only to determine if something worked differently between the two (I tweeted this out yesterday). One of the common problems I hear about and have experienced myself with VSCode (Visual Studio Code) is that tabbed expansion of command and parameter names doesn’t work like it does in the ISE (Integrated Scripting Environment)....

April 16, 2019 · 1 min · 164 words · Mike F. Robbins

Run SQL Server PowerShell Cmdlets as a Different User

One of the ways I practice the principal of least privilege is by logging into my computer as a domain user who is also a standard local user. I typically run PowerShell as a domain user who is a local admin and elevate on a per command basis using a domain account with more access only when absolutely necessary. The problem I’ve run into is neither the account I’m logged into my computer as or the one I’m running PowerShell as has the ability to execute SQL queries that I need to run against various SQL servers in my environment....

April 11, 2019 · 3 min · 507 words · Mike F. Robbins