How To Create PowerShell Function

Overview

In this post we will walk-through the steps as to how to PowerShell functions are helpful in saving time when you have repetitive task(s) to be executed.

Applies To

Tested on Windows 10, Windows 2008 R2 and Windows 2012.

Pre-Requisites

Launch PowerShell Command Console or PowerShell ISE.

To run this script, Execution Policy should be set to either of these “AllSigned” or “RemoteSigned” or “Unrestricted”, you can get current execution policy by running the command; “Get-ExecutionPolicy”. Each Policy type and its purpose is shown in the below table.

Policy Type	Purpose
Restricted	No scripts can be run. Windows PowerShell can be used only in interactive mode.
AllSigned	Only scripts signed by a trusted publisher can be run.
RemoteSigned	Downloaded scripts must be signed by a trusted publisher before they can be run.
Unrestricted	No restrictions; all Windows PowerShell scripts can be run.

PowerShell Script – Function

This PowerShell script call function without any function arguments / parameters.

Code Snippet

Function Call_Function_Write_Welcome_Message
{
    Clear-Host
    Write-Host "`nListing Function information that was created`n"
    dir function: | Where-Object Name -Like "Call_function_Write_Welcome_Message"
    Write-Host "`n__________________________________________"
    Write-Host "`nPurpose of Function printing Hello Message"
    Write-Host "__________________________________________"
    Write-Host "`nHello – PowerShell Script"
    [console]::beep(500,300)
}

Call Function

To invoke /call the function, simply call the function name from the PowerShell CLI or PowerShell ISE.


Call_Function_Write_Welcome_Message

PowerShell Output

When the function is called / executed; below output will be displayed.

SlideShare Info

A step by step guide with screenshot is uploaded to Slideshare.

How To Create PowerShell Function from VCP Muthukrishna