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PS C:\> $iis_servers | remove-pssession
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Or, if you want to close all open sessions, use this command:
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PS C:\> get-pssession | remove-pssession
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Easy enough. Once you get some sessions up and running, what will you do with them For the next couple of sections, I ll assume that you have created a variable named $sessions that contains at least two sessions. I ll use localhost and SERVER-R2; you should specify your own computer names. Using localhost isn t cheating: PowerShell actually starts up a real remoting session with another copy of itself. Keep in mind that this will only work if you ve enabled remoting on all computers that you re connecting to, so revisit chapter 10 if you haven t done so.
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TRY IT NOW Start following along and running these commands, being sure
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to use valid computer names. If you only have one computer, use both its name and localhost. Here s how I ll get my sessions up and running:
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PS C:\> $sessions = New-PSSession -comp SERVER-R2,localhost
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Using sessions with Enter-PSSession
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Bear in mind that I ve already enabled remoting on these computers and that they re all in the same domain. Revisit chapter 10 if you d like a refresher on enabling remoting.
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18.3 Using sessions with Enter-PSSession
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As you hopefully recall from chapter 10, Enter-PSSession is the cmdlet you use to engage a one-to-one remote interactive shell with a single remote computer. Rather than specifying a computer name with the cmdlet, you can specify a single session object. Because my $sessions variable has two session objects, I must specify one of them using an index (which you first learned to do in chapter 15):
PS C:\> enter-pssession -session $sessions[0] [server-r2]: PS C:\Users\Administrator\Documents>
You can see that my prompt changed to indicate that I m now controlling a remote computer. Exit-PSSession will return me back to my local prompt, but the session will remain open for additional use:
[server-r2]: PS C:\Users\Administrator\Documents> exit-pssession PS C:\>
You might have a tough time remembering which index number goes with which computer. In that case, you can take advantage of the properties of a session object. For example, when I pipe my sessions to Gm, I get this output:
PS C:\> $sessions | gm TypeName: System.Management.Automation.Runspaces.PSSession Name ---Equals GetHashCode GetType ToString ApplicationPrivateData Availability ComputerName ConfigurationName Id InstanceId Name Runspace State MemberType ---------Method Method Method Method Property Property Property Property Property Property Property Property ScriptProperty Definition ---------bool Equals(System.Object obj) int GetHashCode() type GetType() string ToString() System.Management.Automation.PSPr... System.Management.Automation.Runs... System.String ComputerName {get;} System.String ConfigurationName {... System.Int32 Id {get;} System.Guid InstanceId {get;} System.String Name {get;set;} System.Management.Automation.Runs... System.Object State {get=$this.Ru...
I can see that the session object has a ComputerName property, so I could filter for that session:
PS C:\> enter-pssession -session ($sessions | where { $_.computername -eq 'server-r2' }) [server-r2]: PS C:\Users\Administrator\Documents>
Sessions: remote control, with less work
That s pretty awkward syntax, though. If you need to use a single session from a variable, and you can t remember which index number is which, it might be easier to forget about using the variable. Even though you stored your session objects in the variable, they re still also stored in PowerShell s master list of open sessions. That means you can access them by using Get-PSSession:
PS C:\> enter-pssession -session (get-pssession -computer server-r2)
That will retrieve the session having the computer name SERVER-R2 and pass it to the -session parameter of Enter-PSSession. When I first figured out that technique, I was impressed with myself, but it also led me to read a bit deeper. I pulled up the full help for Enter-PSSession and looked more closely at the -session parameter. Here s what I saw:
-Session <PSSession> Specifies a Windows PowerShell session (PSSession) to use for the interactive session. This parameter takes a session object. You ca n also use the Name, InstanceID, or ID parameters to specify a PSS ession. Enter a variable that contains a session object or a command that creates or gets a session object, such as a New-PSSession or Get-P SSession command. You can also pipe a session object to Enter-PSSe ssion. You can submit only one PSSession with this parameter. If y ou enter a variable that contains more than one PSSession, the com mand fails. When you use Exit-PSSession or the EXIT keyword, the interactive s ession ends, but the PSSession that you created remains open and a vailable for use. Required Position Default value Accept pipeline input Accept wildcard characters false 1 true (ByValue, ByPropertyName) True
If you think back to chapter 7, that pipeline input information near the end is interesting. It tells me that the -session parameter can accept, from the pipeline, a PSSession object. I know that Get-PSSession produces PSSession objects, so this syntax should also work:
PS C:\> Get-PSSession -ComputerName SERVER-R2 | Enter-PSSession [server-r2]: PS C:\Users\Administrator\Documents>
And it does work! I think that s a much more elegant way to retrieve a single session, even if you ve stored all your sessions in a variable.
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