Sample solutions to practice tasks

solutions.ps1

# practice tasks

# task1: Get all processes that on your machine where the processname starts with 'po'
Get-Process -name po*

#task 2: Get all processes where the handlecount > 1000
Get-Process | Where-Object HandleCount -gt 1000

#task 3: How many files are there in %windir%\System32
Get-ChildItem -File -LiteralPath $env:windir/System32 | Measure-Object
(Get-ChildItem -File -LiteralPath $env:windir/System32).Length

# task 4: Create a powershell function that returns structured output from du.exe.
class DiskUsageInfo {
    [long] $DirectorySize
    [long]$CurrentFileSize
    [string] $Path
    [int]$CurrentFileCount     
    [int]$FileCount 
    [int]$DirectoryCount

    DiskUsageInfo([long] $DirectorySize, [long]$CurrentFileSize, [string] $Path, [int]$CurrentFileCount, [int]$FileCount, [int]$DirectoryCount)  {
            $this.DirectorySize          = $DirectorySize
            $this.CurrentFileSize        = $CurrentFileSize
            $this.Path                   = $Path
            $this.CurrentFileCount       = $CurrentFileCount
            $this.FileCount              = $FileCount
            $this.DirectoryCount         = $DirectoryCount
    }
}

function Get-DiskUsage {
    [Alias('du')]
    [OutputType([DiskUsageInfo])]
    param(
        [Parameter()]
        [string] $Path)
    if ([string]::IsNullOrEmpty($Path)) {
        $Path = $PSCmdlet.SessionState.Path.CurrentFileSystemLocation
    }
    else {        
        $Path = $PSCmdlet.GetUnresolvedProviderPathFromPSPath($Path)
    }
    
    du.exe -nobanner -q -c -l 1 $Path | Where-Object {$_ -and $_ -notmatch '^processing' } |  ConvertFrom-Csv -Delimiter ',' | Foreach-Object {
            [DiskUsageInfo]::new($_.DirectorySize, $_.CurrentFileSize, $_.Path, $_.CurrentFileCount, $_.FileCount, $_.DirectoryCount)    
        }    
}

#task 5 : At what line is the occurrence of 'help' in C:\Windows\System32\WindowsPowerShell\v1.0\en-US\default.help.txt that has the highest column number.
Select-String help C:\Windows\System32\WindowsPowerShell\v1.0\en-US\default.help.txt -AllMatches | Sort-Object {$_.Line.LastIndexOf("help")} -Descending | select-object -first 1
Select-String help C:\Windows\System32\WindowsPowerShell\v1.0\en-US\default.help.txt -AllMatches | Sort-Object {$_.Matches[-1].Index} -Descending | select-object -first 1

#task 6: What is the standard deviation of the size of the dlls under System32
# see https://gist.github.com/powercode/a1d450ab6048b54d23672bb36cc39bbc
 Get-ChildItem  C:\windows\System32\ -file | Foreach-Object Length | Get-StandardDeviation

#task 7: Generate the following text:
<#
'1','2','3','4','5','6','7','8','9','10'
'11','12','13','14','15','16','17','18','19','20'
'21','22','23','24','25','26','27','28','29','30'
'31','32','33','34','35','36','37','38','39','40'
'41','42','43','44','45','46','47','48','49','50'
'51','52','53','54','55','56','57','58','59','60'
'61','62','63','64','65','66','67','68','69','70'
'71','72','73','74','75','76','77','78','79','80'
'81','82','83','84','85','86','87','88','89','90'
'91','92','93','94','95','96','97','98','99','100'
#>
# this is using the 'magic' Foreach method
# see http://www.powershellmagazine.com/2014/10/22/foreach-and-where-magic-methods/
(1..100 | Group-Object {[math]::Floor(($_ - 1)/10)}).Foreach{$_.Group.Foreach{"'$_'"} -join ','}

#task 8: Which two roles in Shakespears Romeo and Juliet has the most lines, and how many words are in those lines?
function Get-RJTopSpeaker {
	param($Path, $count)

    ([xml](Get-Content -Raw $path)).Play.Act.Scene.Speech | Group Speaker | Sort Count -Descending | Select -first $count | Foreach {
        [pscustomobject] @{ Actor=$_.Name;SpeechCount = $_.Count; WordCount = ($_.Group | foreach {-split $_.Line} | Measure-Object).Count }
    }
}