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PowerShell is a powerful scripting language and shell developed by Microsoft to help IT professionals and developers automate tasks and processes in Windows. One of the main benefits of PowerShell is the ability to create reusable scripts that can automate repetitive tasks.
But how do you run those PowerShell scripts? In this comprehensive guide, we’ll cover everything you need to know to successfully run PowerShell scripts from the command line in Windows.
Prerequisites for Running PowerShell Scripts
Before diving into the details of running scripts, let’s quickly cover what you’ll need:
PowerShell Installed – PowerShell comes installed by default in every Windows version starting with Windows 7/Windows Server 2008 R2. So as long as you’re on a supported Windows OS, you likely already have PowerShell.
Execution Policy Set – The execution policy determines whether scripts are allowed to run. It’s likely already set, but double-check to be sure.
Text Editor – To create scripts, you’ll need a basic text editor like Notepad. Popular third-party choices include Visual Studio Code, Atom, Sublime Text, and Notepad++.
PowerShell Script file – This is the PS1 file that contains your PowerShell code and script logic. All PowerShell scripts end with the .ps1 file extension.
As long as those prerequisites are met, you can now run PowerShell scripts! Next let’s look at the different options available.
Methods for Running PowerShell Script Files
There are a few different options for running PowerShell script files from the command line:
Invoke Directly by Path – Call the script directly by pointing to the file path
Dot Sourcing – Execute script contents in current shell’s scope
Job Command – Run script asynchronously as background job
Invoke Operator – Flexible script execution with parameters, output control, etc.
The best option will depend on your specific needs and script requirements. Let’s explore each method.
Invoke PowerShell Scripts by File Path
The most straightforward way to run a PowerShell script is by calling the script file directly using its full file system path:
Script contents execute in the current shell scope
Any functions/variables will persist in session after running
Executes in current shell scope rather than child scope
Functions, aliases, variables persist after script finishes
Output directly printed rather than returnable
Dot sourcing is extremely useful for things like integrating functions, initializing settings, and setting up the environment. The tradeoff is that it lacks options for parameterization or output control.
Up next we’ll look at running scripts as background jobs.
Running PowerShell Scripts as Jobs
You can use the Start-Job cmdlet to execute scripts asynchronously as a PowerShell job:
Here are some other great tips for running PowerShell scripts from the command line:
Check the execution policy – Use Get-ExecutionPolicy to verify the policy is not blocking scripts.
Use full paths – Always use full absolute paths rather than relative to avoid issues.
Leverage parameters – Take advantage of parameter binding to increase reusability.
Handle output – Suppress, capture or redirect output depending on need.
Consider security – Validate script trustworthiness and sanitize any inputs.
Debug issues – For syntax errors, missing cmdlets, etc. test scripts in the shell first.
Also keep in mind that the same PowerShell syntax works for running scripts in the ISE or third-party tools like VSCode. The only difference is specifying a file path since they have direct editor integration.
With those pro tips covered, let’s now run through a hands-on script execution example.
Hands-on Example: Running a PowerShell Script
Let’s walk through executing a sample PowerShell script to see the invoke operator in action:
Create Sample Script – Make a script called get-process-details.ps1 using a text editor.
Add Code – Put the following code in the new PS1 file:Param( [string]$ProcessName ) Get-Process -Name $ProcessName | Select-Object NPM, CPU, Id
Open Shell – Launch a PowerShell session either in the ISE or command prompt.
Execute Script – Run the script while passing a process name argument:PS C:\Scripts> & .\get-process-details.ps1 -ProcessName explorer
See Output – Details on the explorer.exe process will print showing the script executed:NPM(K) CPU(s) Id ------ ------ -- 23 3 2140
And with just a few lines of code we have a reusable PowerShell script extracting process data leveraging parameter binding and output printing!
In this guide you learned multiple methods for running PowerShell script files from the command line, including:
Directly invoking by file path
Dot sourcing into current session
Asynchronously via background jobs
Flexible invocation using the & operator
You also picked up some additional best practices and saw hands-on examples applying these techniques.
Now you have all the knowledge needed to effectively run PowerShell scripts from the command line like a pro! Automate all the things!
Greetings! I am Ahmad Raza, and I bring over 10 years of experience in the fascinating realm of operating systems. As an expert in this field, I am passionate about unraveling the complexities of Windows and Linux systems. Through WindowsCage.com, I aim to share my knowledge and practical solutions to various operating system issues. From essential command-line commands to advanced server management, my goal is to empower readers to navigate the digital landscape with confidence.
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