Lab in Visual Basic .NET

Generation Data Matrix in Visual Basic .NET Lab

17.8 Lab
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The following command is for you to add to a script. You should first identify any elements that should be parameterized, such as the computer name. Your final script should define the parameter, and you should create comment-based help within the script. Run your script to test it, and use the Help command to make sure your comment-based help works properly. Don t forget to read the help files referenced within this chapter for more information. Here s the command:
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Get-WmiObject -class Win32_OperatingSystem ` -computername 'localhost' | Where-Object { $_.BuildNumber -ge 7600 } | Format-Table __SERVER,Caption,BuildNumber,ServicePackMajorVersion, @{l='BIOSSerial';e={ Get-WmiObject -class Win32_BIOS -computername $_.__SERVER | Select-Object -expand SerialNumber }}
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17.9 Ideas for on your own
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Go back through some of the previous chapters and find some commands that you think you might want to run more than once. 7, which included some examples of Active Directory commands, might be a good choice. Once you ve found a command or two, try making them into a parameterized script, and test your script to see if it works. Add comment-based help to explain how the script works, and try viewing the help by using the standard Help command.
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Sessions: remote control, with less work
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Back in chapter 10, I introduced you to PowerShell s remoting features. In that chapter, you used two primary cmdlets Invoke-Command and Enter-PSSession to access both one-to-many and one-to-one remote control. Each of those cmdlets worked by creating a new remoting connection, doing whatever work you specified, and then closing that connection. There s nothing wrong with that approach, but it can be tiring to have to continually specify computer names, credentials, alternative port numbers, and so on. In this chapter, we ll look at an easier, more reusable way of tackling remoting. You ll also learn about a third way of using remoting that will really come in handy.
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18.1 Making PowerShell remoting a bit easier
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Anytime you need to connect to a remote computer, using either Invoke-Command or Enter-PSSession, you have to at the very least specify the computer s name (or names, if you re invoking a command on multiple computers). Depending on your environment, you may also have to specify alternative credentials, which means being prompted for a password. You might also need to specify alternative ports or authentication mechanisms, depending upon how remoting is configured in your organization. None of that is difficult to specify, but it can be tedious to have to do so again and again and again. Fortunately, there s a better way: reusable sessions.
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18.2 Creating and using reusable sessions
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A session is a persistent connection between your copy of PowerShell and a remote copy of PowerShell. While the session is active, both your computer and the remote
Sessions: remote control, with less work
machine devote a small amount of memory and processor time toward maintaining the connection, although there s very little network traffic involved in the connection. PowerShell maintains a list of all the sessions that you ve opened, and you can utilize those sessions to invoke commands or to enter a remote shell. To create a new session, use the New-PSSession cmdlet. Specify the computer name (or names), and, if necessary, specify an alternative username, port, authentication mechanism, and so forth. The result will be a session object, which is stored in PowerShell s memory.
PS C:\> new-pssession -computername server-r2,server17,dc5
To retrieve those sessions, run Get-PSSession:
PS C:\> get-pssession
That works, but I prefer to create the sessions and then immediately store them in a variable. For example, I have three IIS-based web servers that I routinely reconfigure by using Invoke-Command. To make that easier, I ll store those sessions in a specific variable:
PS C:\> $iis_servers = new-pssession -comp web1,web2,web3 -credential WebAdmin
Never forget that those sessions consume resources. If you close the shell, they ll close automatically, but if you re not actively using them, it s a good idea to manually close them even if you re planning to continue using the shell for other tasks. To close a session, use the Remove-PSSession cmdlet. For example, to close just the IIS sessions, use this command:
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