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  • Using Default Parameters

    In PowerShell 3.0, an option was added to define default values for arbitrary cmdlet parameters. This line, for example, would set the default value for the parameter -Path of all cmdlets to a given path: $PSDefaultParameterValues . Add ( ' *:Path...
  • Speeding Up Scripts with StringBuilder

    Often, scripts add new text to existing text. Here is a piece of code that may look familiar to you: Measure-Command { $text = "Hello" for ( $x = 0 ; $x -lt 100000 ; $x ++ ) { $text += "status $x" } $text } This code is particularly...
  • Finding Working Days

    To find all working days in a given month, here is a neat little one-liner: $month = 7 1 . .31 | ForEach-Object { Get-Date -Day $_ -Month $month } | Where-Object { $_ . DayOfWeek -gt 0 -and $_ . DayOfWeek -lt 6 } Simply assign the month to $month (the...
  • Why Directories Have a Size of 1

    Occasionally, you may notice that folders have a length of 1 byte. This was introduced in PowerShell 3.0. In PowerShell 2.0, they did not report back any length. $folder = Get-Item c:\Windows $folder . Length This artifact is caused by yet another feature...
  • Speeding Up Background Jobs

    Background jobs can be a great thing to speed up scripts because they can do things in parallel. However, background jobs only work well if the code you run does not produce large amounts of data - because transporting back the data via XML serialization...
  • Understanding the statement "exit"

    PowerShell supports the keyword "exit" which is a scope-based. It may work much differently than you assumed it would. Let's take a function like this one: function test { ' A ' exit ' B ' } When you save this function in...
  • Using break, continue, and return

    There are two special keywords in PowerShell that you can use in loops: break and continue. With continue, the loop continues but skips the remaining code. When you issue a break, the loop ends prematurely but returns all results. In addition, there is...
  • Dealing with Environment Variables

    To read a Windows environment variable in PowerShell, simply use the prefix "env:": PS> $env:windir C:\Windows PS> $env:USERNAME Tobias Actually, "env:" is a drive, so you can use it to find all (or some) environment variables...
  • Using Nested Hash Tables

    Nested hash tables can be a great alternative to multidimensional arrays. They can be used to store data sets in an easy-to-manage way. Have a look: $person = @ {} $person . Name = ' Weltner ' $person . Id = 12 $person . Address = @ {} $person...
  • Speeding Up Arrays

    When you assign new items to an array often, you may experience a performance problem. Here is a sample that illustrates how you should not do it: Measure-Command { $ar = @ () for ( $x = 0 ; $x -lt 10000 ; $x ++ ) { $ar += $x } } In a loop, an array receives...
  • Using Event Logs Instead of Log Files

    Often, people use file-based logging. There is nothing wrong about that, but using the built-in event log system provided by Windows may be much easier. If you have admin privileges, you can create new event logs any time: New-EventLog -LogName myLog...
  • Reading Registry Values the Easy Way

    With PowerShell, it can be a piece of cake to read out Registry values. Here is your simple code template: $RegPath = ' HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion ' $key = Get-ItemProperty -Path "Registry::$RegPath"...
  • Handling Cmdlet Errors without Interruption

    When you want to use error handlers with errors that occur inside a cmdlet, then you can only catch such exceptions when you set the -ErrorAction of that cmdlet to "Stop". Else, the cmdlet handles the error internally. That's bad because...
  • Fun with Path Names

    You can use the -split operator to easily split a path in its components. The result is always an array. Simply use comparison operators to exclude any part component you do not like, or rename some, then use -join to put the path back together. This...
  • Skipping Profile on Keystroke

    Maybe you'd like to be able to occasionally skip certain parts of your profile script. For example, in the ISE editor, simply add this construction to your profile script (path to your profile script is found in $profile, it may not yet exist): if...
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