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Integer sizes

If you’ve used PowerShell for any time you will be away of [int] meaning integer. One common use is in functions to define a parameter’s data type function test1 { param ( [int]$a, [int]$b ) $a * $b } We can use this function PS> test1 -a 10 -b 6 60 OK simple stuff but what if...

Posted to Richard Siddaway's Blog by RichardSiddaway on Thu, Jan 26 2012
Filed under: Filed under: PowerShell Basics
Folder information on remote machines

A question in the forums wanted to get the date a folder was changed on their domain controllers. This is one way to do it $folder = "Common Files" [System.DirectoryServices.ActiveDirectory.Domain] :: GetCurrentDomain ( ) | select -ExpandProperty DomainControllers | foreach { $dc = $_ . Name...

Posted to Richard Siddaway's Blog by RichardSiddaway on Thu, Jan 19 2012
Filed under: Filed under: File System, PowerShell Basics
Running a function

Most of my scripts end up being functions because I will eventually combine them into modules My recent script function get-logedonuser { param ( [string] $computername = $env:COMPUTERNAME ) Get-WmiObject -Class Win32_LogonSession -ComputerName $computername | foreach { $data = $_ $id = $data . __RELPATH...

Posted to Richard Siddaway's Blog by RichardSiddaway on Wed, Jan 18 2012
Filed under: Filed under: PowerShell Basics
AD provider help

The AD examples in recent posts have shown the *-Item cmdlets used against the AD provider. If you would like more information on how these cmdlets (and the *-ItemProperty cmdlets) work in the AD provider – use Get-Help inside the provider. For example Import-Module ActiveDirectory cd AD: cd dc=manticore...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, Jan 9 2012
Filed under: Filed under: PowerShell and Active Directory, PowerShell Basics
Invoke-Item

One cmdlet I don’t see getting used much is Invoke-Item From the help file “ The Invoke-Item cmdlet performs the default action on the specified item. For example, it runs an executable file or opens a document file in the application associated with the document file type. The default action depends...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, Jan 2 2012
Filed under: Filed under: PowerShell Basics
Formatting file listings–the other way

Following on from the previous post I was asked if the bit where we set the case on the file names and extension could be done in a select statement. Simple answer is yes Get-ChildItem | where { -not $_ . PSIsContainer } | sort Fullname | select @{ N = "FullName" ; E = { $( $_ . Fullname ....

Posted to Richard Siddaway's Blog by RichardSiddaway on Fri, Dec 30 2011
Filed under: Filed under: File System, PowerShell Basics
Formatting file listings

A question was left asking about displaying a file listing with the full name in upper case and the extension in lower case. Its one line of PowerShell Get-ChildItem | where { -not $_ . PSIsContainer } | sort Fullname | Format-Table @{ N = "FullName" ; E = { $( $_ . Fullname . ToUpper ( ) ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Thu, Dec 29 2011
Filed under: Filed under: File System, PowerShell Basics
Selecting Property order

If you run Get-WmiObject -Class Win32_ComputerSystem you get a few properties displayed Domain : WORKGROUP Manufacturer : Hewlett-Packard Model ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Fri, Dec 23 2011
Filed under: Filed under: PowerShell Basics
Using calculated fields in subsequent processing

A calculated field can be created in Select-Object or Format-Table. When you use Format-Table processing effectively stops, the pipeline terminates and you are dumping the results to screen. The objects produced by Format-Table are not meant for further processing. If you use Select-Object to create...

Posted to Richard Siddaway's Blog by RichardSiddaway on Sat, Nov 19 2011
Filed under: Filed under: PowerShell Basics
Multiple value query in WQL

A simple query that demonstrates how to query for multiple values. We want to stop the running services that are running where the names a like BITS and WinRm Get-WmiObject -Class Win32_Service -Filter "State='Running' AND Name LIKE '%BITS%' OR Name LIKE '%WinRM%'" ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, Oct 31 2011
Filed under: Filed under: PowerShell and WMI, PowerShell Basics
PowerShell Deep Dive speakers

Some more sessions have been announced for the Deep Dive http://www.theexpertsconference.com/europe/2011/powershell-deep-dive/session-abstracts/ The speaker line up includes: Aleksandar Nikolic Shay Levy Kirk Munro Dmitry Sotnikov Jeffery Hicks James Brundage Tobias Weltner Brandon Shell James O’Neill...

Posted to Richard Siddaway's Blog by RichardSiddaway on Wed, Sep 21 2011
Filed under: Filed under: PowerShell V2, Deep Dive, PowerShell Basics, PowerShell V3
More timespan

Poking further into the timespan object consider this PS> New-TimeSpan -Days -10 Days : -10 Hours : 0 Minutes ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, Sep 13 2011
Filed under: Filed under: PowerShell Basics
Its a date

If you’ve used PowerShell for any length of time you have come across the Get-Date cmdlet PS> Get-Date 13 September 2011 20:47:50 The cmdlet returns a .NET System.DateTime object. The object has some methods we can use PS> Get-Date | Get-Member -MemberType method Add AddDays...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, Sep 13 2011
Filed under: Filed under: PowerShell Basics
Create a process on a remote machine

We cam use the [wmiclass] to create a process but it doesn’t allow us to set the credentials. We can get round that by using a bit of .NET code. [wmiclass] is as accelerator for System.Management.ManagementClass so we go back to basics function new-process { param ( [string] $computer = "localhost"...

Posted to Richard Siddaway's Blog by RichardSiddaway on Sun, Aug 21 2011
Filed under: Filed under: PowerShell and WMI, PowerShell V2. .NET, PowerShell Basics
Creating files: 1 *content vs out-file

Ever wondered about the differences between add-content and out-file. They both appear to do the same thing but there is a subtle difference. Try this Get-Process | Out-File p1.txt Get-Process | Add-Content p2.txt Get-Process | Set-Content p3.txt If you then do cat p1.txt you get Handles NPM(K...

Posted to Richard Siddaway's Blog by RichardSiddaway on Thu, Aug 18 2011
Filed under: Filed under: PowerShell Basics
Temperature conversion charts

The temperature conversion function we created last time can be used to create a conversion chart. function new-temperaturechart { param ( [int] $start = -10 , [int] $end = 30 , [ parameter ( Mandatory = $true ) ] [string] [ ValidateSet ( "C" , "F" , "K" ) ] $inputTemp ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, Aug 9 2011
Filed under: Filed under: PowerShell Basics
Temperature conversions

I was thinking about temperature conversions and decided to play around with the numbers function convert-temperature { param ( [double] $temperature , [ parameter ( Mandatory = $true ) ] [string] [ ValidateSet ( "C" , "F" , "K" ) ] $inputTemp , [ parameter ( Mandatory ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, Aug 8 2011
Filed under: Filed under: PowerShell Basics
Where to select

Using select-object (aliased to select in common usage) to reduce the number of properties passing into further processing is a common aspect of using PowerShell. However, its not the only place we can do it. Consider this scenario. We need to test the network client on a number of remote machines. We...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, Aug 1 2011
Filed under: Filed under: PowerShell and WMI, PowerShell Basics
Just enough

One thing that never seems to stated is that you don’t need to use the full criteria when searching for something. As an example I wanted to know the COM related services running on a system Get-Service | where {$_.DisplayName -like "*com*"} supplies Status Name ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Sat, Jul 23 2011
Filed under: Filed under: PowerShell Basics
Can I? Should?–copying VBscripts

One of the major errors I see PowerShell newcomers performing is copying script structures and syntax of VBScript into PowerShell. Let me give you an example This piece of VBScript is borrowed from the Windows 2000 scripting guide strComputer = "." Set objWMIService = GetObject("winmgmts...

Posted to Richard Siddaway's Blog by RichardSiddaway on Fri, Jul 22 2011
Filed under: Filed under: PowerShell and WMI, PowerShell Basics

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