Powershell - Commands & Knowledge 04

Front 1

How can you retrieve a list of environment variables?

Back 1

gci env:

OR

Get-ChildItem Env:

Front 2

How can you append a string to a variable?

Back 2

+=
$tableEntry += SomeString1
$tableEntry += SomeString2

Front 3

How can we determine the unique items in a collection?

Back 3

Get-Unique
Get-Content c:\scripts\test.txt | Sort-Object | Get-Unique

Front 4

How to run an executable with arguments - method 1

Back 4

$exe = "X:\setup.exe"
$args = @("/ARG1","VALUE1","/ARG2","VALUE2","/ARG3","/ARG4")
& $exe $args

Front 5

Which command enables you to display data in the Windows PowerShell window and to save that same data to a text file, all with a single command?

Back 5

Get-Process | Tee-Object -file D:\TEMP_Work\test.txt

Front 6

How can you run a PS script located on a network share on the local machine you are logged into?

Back 6

\\server\share\script.ps1
Use this for logging into machines via RDP and running build/config scripts.

Front 7

How can you pause a script in PowerShell?

Back 7

How can you pause a script in PowerShell?
Start-Sleep -s 10

Front 8

What are the implications of upgrading a PowerShell version from the default to a newer version?

Back 8

It might break apps - certain apps such as Exchange/SCCM require certain versions of PS and the WMF.

Front 9

How can you run the erase the contents of a file without deleting the file itself?

Back 9

Clear-Content c:\scripts\test.txt

Front 10

How can you get a history of previously run items on the PS Command Line?

Back 10

Get-History

Front 11

How can you run a previously executed command?

Back 11

Invoke-History 3
Invoke-History 3;Invoke-History 4

Front 12

When using Write-Host, how can you mix colours of text on the same line?

Back 12

Write-Host "Data for " -nonewline; Write-Host "atl-ws-01" -foregroundcolor red -backgroundcolor yellow -nonewline; Write-Host " retrieved May 12, 2006"

Front 13

What is the CMDLET to write a warning message?

Back 13

Write-Warning "The folder C:\Scripts2 does not exist."

Front 14

How can you determine whether or not a specific string value exists in a text file? e.g. Check a log file for the string "error".

Back 14

Get-Content c:\Temp\ErrorLog.txt | Select-String "Failed" -caseinsensitive

Front 15

How can you exit a function immediately?

Back 15

Use the return statement.
function Get-NamedProcess($name=$null) {
if ($name -eq $null) {Write-Host -foregroundcolor Red 'Specify a name!'
return }
Get-Process $name}

Front 16

How can you determine the number of days between two dates?

Back 16

New-TimeSpan cmdlet

Front 17

How can you work around a Citrix XenApp server GPO Lockdown policy that denies CMD prompt access?

Back 17

powershell.exe

Front 18

How can you get info about installed modules?

Back 18

Get-Module -listavailable

Front 19

How to run an executable with arguments - method 2

Back 19

$ChocoStart = 'choco'
$ChocoInstall = 'install'
& $ChocoStart $ChocoInstall 'GoogleChrome'

Front 20

How do you format a function?

Back 20

function Disable-Firewall { netsh advfirewall set allprofiles state off }
# Call the function
Disable-Firewall

Front 21

How can you capture user input?

Back 21

Use Read-Host
$a = Read-Host “Enter your name”
Write-Host "Hello" $a

Front 22

How can you pass Command Line Arguments to script with spaces?

Back 22

myscript.ps1 server1 benp
Accessed in script by $args array
$servername = $args[0]
$username = $args[1]

Front 23

What are four loop options?

Back 23

Do While loop, Do Until loop
For loop, ForEach loop

Front 24

What is the difference between Do While and Do Until loops?

Back 24

Do While loop - repeat a set of commands WHILE a condition is met
Do Until loop - repeat a set of commands UNTIL a condition is met

Front 25

What is the difference between For and ForEach loops?

Back 25

For loop - repeat the same steps a specific number of times
ForEach loop - loop through a collection of objects