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  • Normalizing Line Endings

    All PowerShell Versions When you download files from the Internet, you may run into situations where the file won’t open correctly in editors. Most likely, this is caused by non-default line endings. Here is an example of such a problem. In a previous...
  • Identifying Network Vendors by MAC Address

    All PowerShell Versions Each MAC address uniquely identifies a network device. The MAC address is assigned by a network equipment vendor. So you can backtrack the vendor from any MAC address. All you need is the official IEEE vendor list which is more...
  • Getting MAC Addresses

    All PowerShell Versions Getting the MAC of a network adapter is rather simple in PowerShell. Here is one of many ways: PS> getmac /FO CSV | ConvertFrom-Csv Physical Address Transport Name ---------------- -------------- 5C-51-4F-62-F2-7D \Device\Tcpip_...
  • Advanced Text Splitting

    All PowerShell Versions When you use the –split operator to split text, then the split text is consumed: PS> 'Hello, this is a text, and it has commas' -split ',' Hello this is a text and it has commas As you see, the commas are...
  • Text Splitting

    All PowerShell Versions With the –split operator, you can split text at given locations. The operator expects a regular expression, so if you just want to split using plain text expressions, you need to escape your split text. Here is an example...
  • Replacing Duplicate Spaces

    All PowerShell Versions To eliminate any duplicate space, try this regular expression: PS> '[ Man, it works! ]' -replace '\s{2,}', ' ' [ Man, it works! ] You can use this approach also to convert fixed-width text tables to CSV...
  • Creating TinyURLs

    All PowerShell Versions You probably have heard about shortening long URLs. There are plenty of free services available. Here is a script that turns any URL into a tiny URL: $OriginalURL = ' http://www.powertheshell.com/isesteroids2 ' $url = "http...
  • Finding PowerShell Functions

    PowerShell 3.0 and later To quickly scan your PowerShell script repository and find all files that have a given function in them, try this filter: filter Find-Function { $path = $_ . FullName $lastwrite = $_ . LastWriteTime $text = Get-Content -Path ...
  • Dumping Service State Information

    All PowerShell Versions If you would like to save the results of a PowerShell command to disk so that you can take it with you to another machine, here is a simple way: $Path = " $env:temp\mylist.xml " Get-Service | Add-Member -MemberType NoteProperty...
  • Comparing Service Configuration

    PowerShell 3 and later Provided you have PowerShell remoting up and running on two servers, here is a simple script that illustrates how you can get the state of all services from each server and then calculate the differences between the two servers...
  • Download PowerShell Language Specification

    All PowerShell Versions With PowerShell, it is really easy to download files from the Internet. Here is the code that downloads the PowerShell language specification--a great Word document full of PowerShell gems and internals--automatically to your machine...
  • Waiting for a Keystroke

    All PowerShell versions, PowerShell Console only To keep the PowerShell console open when a script is done, you may want to add a “Press Any Key” statement. Here is a way how you can implement this: Write-Host ' Press Any Key! ' -NoNewline...
  • Finding Errors in Scripts

    All PowerShell Versions It’s never been easier to find scripts with syntax errors in them. Just use this filter: filter Test-SyntaxError { $text = Get-Content -Path $_ . FullName if ( $text . Length -gt 0 ) { $err = $null $null = [ System.Management...
  • Testing Whether Text Contains Upper Case

    All PowerShell Versions Use regular expressions to check whether a string contains at least one upper case letter: $text1 = ' this is all lower-case ' $text2 = ' this is NOT all lower-case ' $text1 -cmatch ' [A-Z] ' $text2 -cmatch...
  • Getting the Number of Lines in a String

    All PowerShell Versions Here is a clever trick how to find out how many lines a string (not a string array!) contains: $text = @' This is some sample text Let's find out the number of lines. '@ $text . Length - $text . Replace ( "`n"...
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