How scriptblock works in PowerShell?
https://www.tutorialspoint.com/how-scriptblock-works-in-powershell
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10-09-2020 - |
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How scriptblock works in PowerShell?
Scriptblock is a set of commands which can be executed together when they are invoked. In PowerShell, generally, we write individual commands. Scriptblock can be written with two curly brackets.
Example
$sb = {Get-Process powershell; Get-Service W32Time}Here we have written two commands under scriptblock. If you directly run this command, scriptblock treats them as a string.
PS C:\> $sb Get-Process powershell; Get-Service W32Time
To run the commands inside the scritblock, use Invoke-Command with the -Scriptblock parameter.
Invoke-Command -ScriptBlock $sb
Output
Handles NPM(K) PM(K) WS(K) CPU(s) Id SI ProcessName ------- ------ ----- ----- ------ -- -- ----------- 529 44 240240 256164 36.02 7668 1 powershell Status : Running Name : W32Time DisplayName : Windows Time
To run the commands on the remote computers, use -ComputerName parameter.
Example
Invoke-Command -ComputerName Test1-Win2k16,Test1-Win2k12 -ScriptBlock $sb
Output
PS C:\Scripts\AppdInstallation_Remote> Invoke-Command -ComputerName Test1- Win2k16,Test1-Win2k12 -ScriptBlock $sb Handles NPM(K) PM(K) WS(K) CPU(s) Id SI P rocessName PSComputerName ------- - ----- ----- ----- ------ -- -- ----------- -------------- 434 29 46200 47564 0.70 3228 1 powershell Test1-Win2k12 Status : Running Name : Spooler DisplayName : Print Spooler PSComputerName : Test1-Win2k12 583 29 57892 64636 0.59 4524 1 powershell Test1-Win2k16 Status : Stopped Name : Spooler DisplayName : Print Spooler PSComputerName : Test1-Win2k16
You can also pass the parameters inside the scriptblock using -ArgumentList parameter in InvokeCommand cmdlet. Declaration of param will be the same as the function in PowerShell.
Example
Invoke-Command -ComputerName Test1-Win2k16,Test1-Win2k12 -ScriptBlock $sb
$sb = {
param($process,$service)
Get-Process -Name $process
Get-Service -Name $service
}
Invoke-Command -ScriptBlock $sb -ArgumentList "PowerShell","W32Time"Output
NPM(K) PM(M) WS(M) CPU(s) Id SI ProcessName ------ ----- ----- ------ -- -- ----------- 43 234.39 22.84 43.61 7668 1 powershell Status : Running Name : W32Time DisplayName : Windows Time
