PowerShell Function Primer

Richard Siddaway at IT Knowledge Exchange answers a very basic question that many new PowerShell scripters run into - Once I create a function, how do I use it.

Most of my scripts end up being functions because I will eventually combine them into modules

My recent script

function get-logedonuser {
param (
 [string]$computername = $env:COMPUTERNAME
)
Get-WmiObject -Class Win32_LogonSession -ComputerName $computername |
foreach {
 $data = $_                        

 $id = $data.__RELPATH -replace """", "'"
 $q = "ASSOCIATORS OF {$id} WHERE ResultClass = Win32_Account"
 Get-WmiObject -ComputerName $computername -Query $q |
 select @{N="User";E={$($_.Caption)}},
 @{N="LogonTime";E={$data.ConvertToDateTime($data.StartTime)}}
}
}

Prompted a comment about how could you run this script.

First off I would save it to a file – get-logedonuser.ps1

You can then either

(read more)

If you are running PowerWF, it is very easy to leverage a function you find on the internet.  Simply paste the function into a script block in the workflow and then either call it from that script block or from elsewhere in your workflow.

• #how to
• #powershell
• #PowerWF