New Exercise: Part 1 (1-25) Complete

content/exercises/part-1.md

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+title = "Part 1 Exercises"
+summary = "All 10 exercises & my solutions in Part 1."
++++
+
+### Exercise 1
+
+Get all services where the display name begins with ‘Windows’.
+
+```powershell
+Get-Service -DisplayName Windows*
+```
+
+
+### Exercise 2 
+
+Get a list of all classic event logs on your computer.
+
+```powershell
+Get-WinEvent -ListLog * | ? {$_.IsClassicLog}
+```
+
+
+### Exercise 3
+
+Find and display all of the commands on your computer that start with ‘Remove’.
+
+```powershell
+gcm -Verb Remove
+```
+
+### Exercise 4
+
+What PowerShell command would you use to reboot one or more remote computers?
+
+```powershell
+Restart-Computer <ComputerNames>
+```
+
+### Exercise 5
+
+How would you display all available modules installed on your computer?
+
+```powershell
+Get-Module -ListAvailable
+```
+
+### Exercise 6
+
+How would you restart the BITS service on your computer and see the result?
+
+```powershell
+Restart-Service BITS -PassThru
+```
+
+### Exercise 7
+
+List all the files in the %TEMP% directory and all subdirectories.
+
+```powershell
+ls $env:TEMP -Recurse -File
+```
+
+### Exercise 8
+
+Display the access control list (ACL) for Notepad.exe.
+
+```powershell
+Get-Acl (Get-Command notepad.exe).Path | Format-List
+```
+
+### Exercise 9
+
+How could you learn more about regular expressions in PowerShell?
+
+```powershell
+help about_Regular_Expressions
+```
+
+### Exercise 10
+
+Get the last 10 error entries from the System event log on your computer.
+
+```powershell
+Get-WinEvent -FilterHashtable @{Logname="System";Level=2} -MaxEvents 10
+```
+
+### Exercise 11
+
+Show all of the ‘get’ commands in the PSReadline module.
+
+```powershell
+Get-Command -Verb Get -Module PSReadline
+```
+
+### Exercise 12
+
+Display the installed version of PowerShell.
+
+```powershell
+$PSVersionTable.PSVersion
+```
+
+
+### Exercise 13
+
+How would you start a new instance of Windows PowerShell without loading any profile scripts?
+
+```powershell
+PowerShell -NoProfile
+```
+
+### Exercise 14
+
+How many aliases are defined in your current PowerShell session?
+
+```powershell
+(gal | Measure-Object).Count
+```
+
+### Exercise 15
+
+List all processes on your computer that have a working set size greater than or equal to 50MB and
+sort by working set size in descending order.
+
+```powershell
+ps | ? {$_.ws -gt 50mb} | sort ws -Descending
+```
+
+### Exercise 16
+
+List all files in %TEMP% that were modified in the last 24 hours and display the full file name, its size,
+and the time it was last modified. Write a PowerShell expression that doesn’t rely on hard-coded
+values.
+
+```powershell
+Get-ChildItem $env:TEMP | ? {$_.LastWriteTime -gt ((Get-Date).AddDays(-1))} | select Name,Length,LastWriteTime
+```
+
+### Exercise 17
+
+Get all files in your Documents folder that are at least 1MB in size and older than 90 days. Export
+the full file name, size, creation date, and last modified date to a CSV file. You may have to adjust
+the exercise based on files you have available.
+
+```powershell
+$minimumAge = (Get-Date).AddDays(0)
+$files = $env:USERPROFILE + "\Documents\" | ls -Recurse -File | ? {($_.Length -gt 1MB) -and ($_.CreationTime -lt $minimumAge)}
+$files | select Name,@{Name="Size"; Expression={"{0:f2} MB" -f ($_.Length / 1MB)}},CreationTime,LastWriteTime | Export-Csv "./document_list.csv" -NoType
+```
+
+### Exercise 18
+
+Using files in your %TEMP% folder, display the total number of each files by their extension in
+descending order
+
+```powershell
+ls $env:TEMP -Recurse -File | group Extension | sort Count -D | select Count, Name
+```
+
+The `select` at the end can also be done with `Group-Object`'s `-NoElement` command.
+
+### Exercise 19
+
+Create an XML file of all processes running under your credentials.
+
+```powershell
+$domain = "{0}\{1}" -f $env:USERDOMAIN,$env:USERNAME
+ps -IncludeUserName | ? {$_.Username -eq $domain} | Export-Clixml .\user_processes.xml -Depth 1
+```
+
+Another way to get the current user's domain/credentials is the `whoami` command.
+Runs for 29 seconds. Increase depth for increased object detail, but export time is increased tenfold.
+
+### Exercise 20
+
+Using the XML file, you created in the previous question, import the XML data into your PowerShell
+session and produce a formatted table report with processes grouped by the associated company
+name.
+
+```powershell
+Import-Clixml .\user_processes.xml | sort Company | Format-Table -GroupBy Company
+```
+
+### Exercise 21
+
+Get 10 random numbers between 1 and 50 and multiply each number by itself.
+
+```powershell
+Get-Random -Count 10 -Minimum 1 -Maximum 50 | % {$_ * $_}
+```
+
+### Exercise 22
+
+Get a list of event logs on the local computer and create an HTML file that includes ‘Computername’
+as a heading. You can decide if you want to rename other headings to match the original cmdlet
+output once you have a solution working.
+
+```powershell
+Get-WinEvent -ListLog * | select LogName, LogMode, RecordCount, @{Name="Max Size (MB)";Expression={[int] ($_.MaximumSizeInBytes / 1mb)}} | ConvertTo-Html -PreContent "<h1>$($env:COMPUTERNAME)</h1>" | Out-File event-log.html
+```
+
+### Exercise 23
+
+Get modules in the PowerShell Gallery that are related to teaching
+
+```powershell
+Find-Module -Tag teaching -Repository PSGallery
+```
+
+Copied directly from the solution; couldn't figure this one out. Funny enough, the version is 4.2.0, and I'm writing this
+on 4/20.
+
+Also, it's quite apparent that this exercise is trying to promote the author's own module, _PSTeachingTools_ as the only module that
+comes up is authored by him.
+
+```powershell
+> Find-Module -Tag teaching -Repository PSGallery | select Name,Version,Type,Description,Author | Format-List
+
+Name        : PSTeachingTools
+Version     : 4.2.0
+Type        : Module
+Description : A set of commands and tools for teaching PowerShell.
+Author      : Jeff Hicks
+```
+
+I guess he won, because he got me to look at the module, as well as whoever reads this.
+
+### Exercise 24
+
+Get all running services on the local machine and export the data to a JSON file. Omit the required
+and dependent services. Verify by re-importing the JSON file.
+
+```powershell
+gsv | ? {$_.Status -eq "Running"} | select * -Exclude *Services* | ConvertTo-Json -Compress | Out-File running_services.json
+Get-Content .\running_services.json | ConvertFrom-Json
+```
+
+My solution had issues initially due to depth (required and dependent services are included, thus services would be referenced within services).
+
+By simply adding a `select -Exclude` to remove those two properties, the output file size is reduced and warnings about JSON being
+truncated go away.
+
+### Exercise 25
+
+Test the local computer to see if port 80 is open.
+
+```powershell
+(Get-NetTCPConnection -state Listen -LocalPort 80 | measure).Count -ge 1
+(Test-NetConnection -ComputerName localhost -Port 80 -WarningAction SilentlyContinue).TcpTestSucceeded
+```
+
+The first line contains my personal solution, the second solution is one the book gave, but slightly tweaked. Both return a `True` or `False`.
+
+The solution provided by the book seems sorta odd, but it does genuinely "test" the connection. Additionally, it uses
+the `CommonTCPPort` parameter, which I can't find any information on.
+
+Instead, given that we only need to know about open ports running on the local computer, we can simply gather all open listening
+connections on the computer and see if Port `80` is among them. I tested it against port `4884` which is running my 
+local Hugo instance, and it worked for both commands above.