Advanced PowerShell ScriptingJeffrey P. SnoverPartner Architect

Agenda

State of the SoftwareCommunity Technology PreviewForms and Styles of Scripting V1 Advanced Scripting Techniques

ScriptblocksSwitch

V2 Advanced Scripting TechniquesCmdletsPSJobs

Warning: this will do DEEP and FAST quickly

State of the SoftwarePhenomenal rate of adoption

> 1.55 Million downloads in < 1 yearExchange 2007, MOM 2007, Virtual Machine Manager 2007, Lotus Domino Transporter Suite, Data Protection Manager, Compute Cluster Tool Pack, Windows Server, BackupGood ISV pickup> 20 new internal partners

CEC 2009 requirementWon both Best of TechEd and Teched Attendees Pick

State of the Software - CommunityActive and useful Newsgroups and Forums

25 Codeplex projects (2 in the top 25 most active)Strong group of MVPsStrong community tools

Tower of Power

Announcing : PowerShell V2 Community Technology Preview (CTP)

Availability /Applicability

The PowerShell V2 CTP is not for everyoneRead this PowerShell Team blog entry:

http://blogs.msdn.com/powershell/archive/2007/11/02/ctp-watch-this-space.aspx 

PowerShell V2 Themes

Universal Code Execution Model

GUI over PowerShell

Production Scripting

Community Feedback

Call To Action

Read the PowerShell blog Download PowerShell CTP

On non-production systems

Kick the tires and let us know what we got right/wrongLet us know about any incompatibilities with V1

Forms of Scripting

ScriptsFiltersFunctionsCmdlets [New in V2]

Styles of Scripting

Ad HocRun at the command line

Simple BASH styleParameters are not named or typed

FormalParameters are named, typed, have initializers

SophisticatedRich error handlingSupport –Verbose, -Debug, -Confirm, -WhatifDigitally signed

Styles of Scripting

Jeffrey SnoverWindows Management Partner Architect

demo

Script Blocks

Script is a first class datatypeAlready used in lots of the utilities and infrastructureScriptBlocks can have parametersYou can pipeline to ScriptBlocks using BEGIN,PROCESS,END code blocks

$x={BEGIN{$x=0} PROCESS{$x++; write-verbose “$x $_”}}Get-Process |&$x

Scriptblocks can be parameters[ScriptBlock]$AssemblyFilter

Scoping depends upon invocation. $x #Runs in current scope& $x #Runs in a new scopeInvoke-Command $x # Runs in a new scope

ScriptBlocks

Jeffrey SnoverWindows Management Partner Architect

demo

Switch

Queen of Control statementsCombines pattern matching, branching and iterationCan operate on a singleton or a collectionVERY rich pattern matchingCan process an entire file

Switch –options (<pipeline>){ <Pattern> { <StatementList> }

<Pattern> { <StatementList> }default { <StatementList> }

}

Switch

Jeffrey SnoverWindows Management Partner Architect

demo

Script Cmdlets

Functions, Filters, CmdletsSupports most everything a .NET Cmdlet can do

Attributes on Cmdlet

-SupportsShouldProcess-ConfirmImpact {Low|Medium|High}

Attributes on Parameters$CMDLET similar to a C# THIS

$Cmdlet.ShouldProcess(“Target”, “Action”)$Cmdlet.ShouldContinue(“Query”, “Caption”)

Engine does a TON of work for you Drives consistent syntax and semantics

Parameter Attributes

MandatoryPosition(int)Alias(string)ValueFromPipeline, ValueFromPipeLineByNameAllowNull, AllowEmptyString, AllowEmptyCollectionValidateRange(int,int), ValidateLength(int,int) , ValidateNotNull, ValidateNotNullOrEmpty, ValidatePattern(regex), ValidateSet(string[],bool), ValidateCount(int,int), ValidateScript(scriptblock)Customer attributes supported as wellParameterSets are not supported in this CTP

$cmdlet

MethodsCurrentProviderLocation, GetResolvedProviderPathFromPSPath, GetResourceString, GetUnresolvedProviderPathFromPSPath, GetVariableValueInvokeShouldContinue, ShouldProcessThrowTerminatingError, WriteCommandDetail, WriteDebug, WriteError, WriteObject, WriteProgress, WriteVerbose, WriteWarning

PropertiesCommandOrigin, CommandRuntime, Host, InvokeCommand, InvokeProvider, JobRepository, MyInvocation, ParameterSetName, SessionState, Stopping

ScriptCmdlet – Engine Functions

-OutVariable-ErrorAction , -ErrorVariable-Whatif, -Confirm, -Verbose-Debug

ScriptCmdlets

Jeffrey SnoverWindows Management Partner Architect

demo

V2 – Universal Code Execution Model• Commands, expressions and ScriptBlocks can

be run• in the foreground or background • on one or more machines• over a LAN or a WAN• in unrestricted or restricted environments• using short or long connections• using impersonation or supplied credentials• initiated by user input or by events

Universal Code Execution Model

Foreground Background

Local Invoke-Expression Start-PsjobWait/Receive/Stop

Remote / Remote many

-ComputerName <name[]>-Runspace <runspace[]>-Throttle <int>-PSCredential-ShellName<Connection info [port, useSSL, shellid]>

-ComputerName <name[]>-Runspace <runspace[]>-Throttle <int>-PSCredential -ShellName <Connection info [port, useSSL, shellid]>

Background Jobs

Commands, expressions and scriptblocks can be run in the foreground or background on one or more machinesPSJOB – Start, Get, Wait, Receive, Stop, RemoveProvide a runspace or it will create a local runspace connectionJobs can contain ChildJobs

Operate on them individually or collectively

Summary/Call to ActionNow available at: www.microsoft.com/downloads

Search for PowerShell

Try it, Deploy it, Use it, Share

Community ResourcesNewsgroup: Microsoft.Public.Windows.PowerShellTeam blog:

http://blogs.msdn.com/PowerShell/PowerShellCommunity.Org:

http://www.PowershellCommunity.OrgChannel 9

http://channel9.msdn.com/tags/PowerShellWiki

http://channel9.msdn.com/wiki/default.aspx/Channel9.WindowsPowerShellWiki

Script Center:http://www.microsoft.com/technet/scriptcenter/hubs/msh.mspx

CodePlex:http://codeplex.com/Project/ProjectDirectory.aspx?TagName=powershell

Many excellent booksManning Press book by PowerShell Dev Lead Bruce Payette: PowerShell in Action

http://manning.com/powershell/ O’Reilly book by PowerShell Dev Lee Holmes – Windows PowerShell Cookbook

http://www.oreilly.com/catalog/9780596528492/index.html

Questions?

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© 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.

The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the

date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.