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Scripting Games - Filter early again

Grading the scripts in Event 4 and the one thing that jumps out is the amount of unnecessary data being carried through the scripts You were asked for 7 properties off 20 random users Get-ADUser has a –properties parameter. USE it to restrict the properties you return. You don’t NEED all the other properties...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, May 21 2013
Filed under: Filed under: Powershell, PowerShell and Active Directory, Scripting Games
Scripting Games - Win32_LogicalDisk or Win32_Volume

I have heard some discussions recently regarding whether Win32_LogicalDisk or Win32_Volume should be used in the answer to event 3 in the Scripting Games. The problem requires you pull the drive letter, drive size and freespace for local disks on the server. Notice the emphasis – that will be important...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, May 20 2013
Filed under: Filed under: Powershell, PowerShell and WMI, Scripting Games
Scripting Games-Subfunctions

One of the principles of writing scripts (or any code) is the KISS principle – Keep It Simple Scripter. That principle is being abused al lot in event 3 I am seeing numerous entries that define an advanced function as the solution and then inside the PROCESS block define one or more functions. ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Thu, May 16 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting Games–filtering on remote server

In event 3 you have to get information on hard disk capacity. I’ve only looked at the first couple of dozen scripts but seen this too many times Get-WmiObject -Class Win32_LogicalDisk | where DriveType -eq 3 or if you prefer the version 2 way Get-WmiObject -Class Win32_LogicalDisk | where {$_.DriveType...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, May 14 2013
Filed under: Filed under: Powershell, PowerShell and WMI, Scripting Games
Scripting games–ErrorActionPreference

I’ve seen a lot of this type of thing in events 1 and 2 $ErrorPref = $ErrorActionPreference $ErrorActionPreference = "Stop" Don’t The default for $ErrorActionPreference is Continue. This means that the error message is shown and the cmdlet attempts to continue. The possible values...

Posted to Richard Siddaway's Blog by RichardSiddaway on Sun, May 12 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting Games–making work

I saw this in one of the submissions: $Properties = @{} $Properties['Computer'] = $SystemInfo.__SERVER $Properties['OperatingSystem'] = "$($OSInfo.Caption) - $($OSInfo.CSDVersion)" $Properties['PhysicalMemory'] = $SystemInfo.TotalPhysicalMemory My immediate...

Posted to Richard Siddaway's Blog by RichardSiddaway on Thu, May 9 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting Games-don’t repeat the work

There are some good features to this script but what really hurts is the two trips to the server for the Win32_Computersystem class Foreach ($IP in (Get-Content "C:\IPList.txt")) { $Name = (Get-WMIObject Win32_ComputerSystem -ComputerName $ip).Name $Mem = [math]::truncate((Get-WMIObject Win32_ComputerSystem...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, May 7 2013
Filed under: Filed under: Powershell, PowerShell and WMI, Scripting Games
Scripting Games–how not to output data

I haven’t finished blogging about event 1 yet but this caught my eye. Things aren’t too bad until we hit the bunch of write-host calls $wrks = (Get-Content -path C:\IPList.txt) foreach ($wrk in $wrks) { $osver = Get-WMIObject -class win32_operatingsystem -ComputerName $wrk ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, May 7 2013
Filed under: Filed under: Powershell, PowerShell and WMI, Scripting Games
Scripting Games: event 1–use of robocopy

The object of the exercise in both the beginners and advanced sections of event 1 was to move a set of log files older than a give data to an archive folder. A number of solutions were presented that used robocopy. This is a workable solution that meets the lettter of the objective but it doesn’t really...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, May 6 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting Games–major dislike #2

I’ve already blogged about incorrect use of backticks. Here is another example of un-necessary use of backticks $Files= Get-ChildItem ` -Path $Path ` -include $Type ` ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, May 6 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting games-major dislike

One of the things we were asked to blog about as Scripting Games judges was things we liked and disliked. This code is a major dislike Get-ChildItem $sourceDirectory | ? {$_.PsISContainer } | % { $subDirectory = $_ ; Get-ChildItem ("$sourceDirectory\$subDirectory")...

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, May 6 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting Games–integer parameters

I keep seeing paramter constructs like this: [int]$age = '90' Why set the parameter to an integer and then set the default as a string. PowerShell will convert but it just doesn’t make sense. All you need is [int]$age = 90

Posted to Richard Siddaway's Blog by RichardSiddaway on Mon, May 6 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting games–using parameters

I am seeing an incredible number of scripts that have this sort of coding round parameters # Input from the user [Parameter(Mandatory=$false, ValueFromPipeline=$False, ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Sun, May 5 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting Games–observation

I don’t have the numbers to back this up but my feeling is that the Scripting Community is marking the entries for this years Games in a harsher manner than the judges did over the last few games. What will be very interesting is the level, type and usefulness of the comments that come through. if you...

Posted to Richard Siddaway's Blog by RichardSiddaway on Sun, May 5 2013
Filed under: Filed under: Powershell, Scripting Games
Scripting Games–a word of advice for competitors

At the moment it isn’t necessary to run your script to give a vote. Probably the quickest way to lose points is have an obvious and glaring error in your script such as . . . | where {$_.LastWriteTime –lt ( date ).ADDdays(-90)} | . . . or . . . | where {$_.LastWriteTime –lt (get-date). ADDseconds...

Posted to Richard Siddaway's Blog by RichardSiddaway on Wed, May 1 2013
Filed under: Filed under: Powershell, Scripting Games
Filter vs Include

I’ve gone through most of the Beginner event submissions over the last couple of days. One thing that has jumped out is the potential misunderstanding around using the –include or –filter parameters on get-childitem. If we look at the two parameters -Include <String[]> ...

Posted to Richard Siddaway's Blog by RichardSiddaway on Wed, May 1 2013
Filed under: Filed under: Powershell, Scripting Games, PowerShell Basics
Getting the folder name

Consider the file information from get-childitem PS> $file = ls servicesv0.6.txt Fullname gives the full path to the file PS> $file.Fullname C:\MyData\SkyDrive\Data\scripts\servicesv0.6.txt if you use DirectoryName you get the full path to the parent directory PS> $file...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, Apr 30 2013
Filed under: Filed under: Powershell, Scripting Games
Don’t go mad on a one liner

Looking at my first group of entries for Beginners Event 1 I’ve noticed what seems like a fanatical attempt to squash everything onto one line. command; command; command; command is NOT a one liner. The ; marks the end of a line command | command | command | command IS a one liner, even if...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, Apr 30 2013
Filed under: Filed under: Powershell, Scripting Games
Read the Question

When my children were at school and going off for a test or exam the last thing I told them was read the question. It seems this needs to be repeated for the Scripting Games. The Beginners Event 1 involved MOVING files from one server to another. I have seen a significant number of answers that...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, Apr 30 2013
Filed under: Filed under: Powershell, Scripting Games
Backticks are baaaaaad; don’t do backticks

The voting/judging process has started for event 1 in the 2013 Scripting Games. What I’m going to be doing over the next few weeks is point out some of the things that I’ve noticed when judging. Some will be good things that I think you should adopt; others will be bad things that you should avoid...

Posted to Richard Siddaway's Blog by RichardSiddaway on Tue, Apr 30 2013
Filed under: Filed under: Powershell, Scripting Games

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