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In just one hour i will make you a power shell ninja

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A one-hour blast through the basics of PowerShell with particular focus on discovery within the environments, and with a demo at the end of a PowerShell take on Wordpress's Hello Dolly plugin

A one-hour blast through the basics of PowerShell with particular focus on discovery within the environments, and with a demo at the end of a PowerShell take on Wordpress's Hello Dolly plugin

Published in: Software

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  • This is where we use the lyrics you brought along. We want to make something a little akin to Wordpress’s “Hello Dolly” plugin, which shows a random lyric from Hello Dolly on Admin pages

    First, we want to open that text file and load it into a variable. We have a cmdlet that can do that for us called Get-Content

    By default, Get-Content loads a file line-by line into an array of strings. This is perfect for our needs. Try it. Do $lines = Get-Content “filename.txt”

    and then write $lines to the screen. Good. We’re loading the lyrics

    Now we need a cmdlet that can pick a random number for us. Get-Help random should tell you what we have available.

    Now we could use that cmdlet with a -maximum value of the array length, then pick the corresponding element from the array, but we don’t have to, because Get-Random takes pipeline input

    Try it. Try $lines | Get-Random

    Ooooh look.

    Assign that to a variable, $line = ($lines | Get-Random)

    $line

    Now we can package that into a function

    Do ctrl-j, press F and pick Function

    put your code inside

    Function Get-Lyric
    {
    $lines = Get-Content $homelyrics.txt
    $randomline = ($filecontent | Get-Random)
    Write-Host $randomline -foregroundcolor yellow
    }

    Oooh, you have a function

    Highlight the function.
    Press F8 or hit the “run selection” button
    Your code is now interpreted and ready to use
    Type Get-Lyric in the command area
    Press enter
    Tada!

    You have a working function.

    But we can make it much more elegant, using the pipeline to shunt data from the left to the right

    Function Get-Lyric
    {
    Get-Content $homelyrics.txt | Get-Random | Write-Host -foregroundcolor yellow
    }

    Now we can get it to run every time we load powershell

    type

    ise $profile.CurrentUserAllHosts

    paste in your function

    Type a function call just underneath it

    Save it.

    Close all your powershell windows
    start a new powershell session

    TADA!!

    Now type Get-Lyric

    DOUBLE TADA!!

    And we’re done.


  • You have all the information you need now to go ahead and start writing awesome powershell scripts

    You know how to query the help system

    you know how to call commands and use parameters

    you know how to write functions

    You know how to sort, query and filter

    you know about the ISE - and you should REALLY be using the ISE

    you know about the pipeline

    you know how to customise your powershell profile

    But most importantly you know how to find the information you don’t have

    Now, delete the shortcut to cmd.exe and replace it with powershell. Get into the habit of starting powershell instead of a command line and whenever you want to do something, consider if you can do it by typing a command

    Closing Test Questions

    What cmdlets might I use if I want to do something in PowerShell but can’t remember what the exact command is?

    What Cmdlet might I use to fire of a request to a REST Service?

    I want to do a wildcard search of a long array. What cmdlet and what comparison operator might I use?

    What’s the command to open my default profile in the ise?

    I need to know if a folder exists, what cmdlet might I use?

    I want to open a text file, what cmdlet do I use?

    Why is the pipeline important?





  • Transcript

    • 1. In Just One Hour I Will Make You A PowerShell Ninja A Flying Start Into PowerShell
    • 2. What you should have In your meeting invite, you should have received a list of pre-reqs ● Laptop running Windows 7 or later (not RT) ● A text file containing, line-by-line, the lyrics to your favourite song ● Your typing fingers ● Optional: exposure to other programming languages such as C, C#, Java, Perl, Python, JavaScript or VBScript ● Distractions are strictly banned. Close all non-powershell windows and put your phone face down on the table.
    • 3. What we will do A crash course into Powershell Basics, including: ● The Raw Language Basics - covered more fully in a later module ● The Help System and exploring the environment ● The Pipeline ● Working with files and folders ● A quick peek at Profiles - covered more fully in a later module It’s a lot to cover in an hour, and we’re bound to get sidetracked, so let’s get started
    • 4. Getting Started This is a hands-on lab. Fire Up PowerShell The icon looks like this:
    • 5. Getting started with Cmdlets Cmdlets are what they sound like. They’re little commands They do stuff, usually fairly simple stuff They Get- stuff. They Set- stuff. They Invoke- stuff. They Test- stuff They’re the tiny engines of powershell Many of them have quick, snappy aliases
    • 6. A thing called the pipeline the pipeline allows you to string commands together, shunting data from left to right
    • 7. OK, Yeah, but it’s better than that Consider the following code snippet
    • 8. The basics summarised ● Variables are prefixed with a dollar sign ● Code blocks are delimited with curly braces ● Assignment operators are =, +, etc ● Comparison Operators are -lt, -gt, -eq, -like etc ● Commands (called Cmdlets in PS World) follow a Verb-Noun convention ● Powershell is extensible via Modules ● But you REALLY don’t need to remember this Because….
    • 9. Powershell is internally-documented There are Cmdlets that tell you about Cmdlets ● Get-Command ● Get-Help ● Get-Alias ● Get-Module ● Get-Member
    • 10. Environment Variables You’ll also want to know about environment variables $Env: $home $psversiontable
    • 11. OK, so what next? So far you’ve just been working at the prompt Now it’s time to start writing basic scripts. First, let’s get set up
    • 12. Simple functions Functions allow you to package up lumps of code and call them from other lumps of code. We’re going to write a function now. Then we’re going to modify it Then we’re going to run it Then (bonus!) we’re going to make it run whenever we start powershell
    • 13. In summary You now have the tools you need to: ● Run commands ● Write scripts ● Find help ● Customise your environment So go forth and be a ninja

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