Get-EventLog [-LogName] <String> [[-InstanceId] <Int64[]>] [-After <DateTime>] [-AsBaseObject] [-Before <DateTime>] [-ComputerName <String[]>] [-EntryType {Error | Information | FailureAudit | SuccessAudit | Warning}] [-Index <Int32[]>] [-Message <String>] [-Newest <Int32>] [-Source <String[]>] [-UserName <String[]>]
[<CommonParameters>]

Get-EventLog [-AsString] [-ComputerName <String[]>] [-List] [<CommonParameters>]

• There are two possible combinations of parameters you can’t mix between them, some commands may have more than 2 sets.
• Anything in square brackets is optional.
• If you omit optional parameter names then they MUST be provided in the correct order! (e.g. ‘Get-EventLog Security 10’ is shorthand for  ‘Get-EventLog -LogName Security -InstanceID 10’. ‘Get-EventLog 10 Security’ will not work as there is no Event Log called 10).

[-LogName] <String>

• The log name is not optional as its not in square brackets but actually writing the word LogName is!

[[-InstanceId] <Int64[]>]

• Instance ID is optional (the whole thing is in square brackets
• Writing ‘-InstanceID’ is optional
• InstanceID expects a 64-bit integer (-9223372036854775808 to 9223372036854775807) and the additional square brackets indicate it will accept and array or list of them

[-List]

• This is a switch, essentially a parameter without a value

[<CommonParameters>]

• These are a bunch of parameters available to ALL commands

Finding the alias of a command:

get-alias -Definition "Get-Service"

Finding the command of an alias

Get-alias gsv

Help gsv

Finding the alias of a parameter (getting the alias of the computername parameter for ‘Get-EventLog’):

(get-command get-eventlog | select -ExpandProperty parameters) .computername.aliases

Finding the parameter of an alias (getting the parameter of the -Cn alias for ‘Get-EventLog’):

get-eventlog -Cn

(this will error with the error displaying the full parameter name of the Alias)

Help Get-EventLog

Help Get-EventLog -full

Help Get-EventLog -showwindow

Help Get-EventLog -online

The best help command ever!!!!

Use PowerShell to Persist Environment Variables

From an elevated powershell

[System.Environment]::SetEnvironmentVariable(‘MyAwesomeTargetFolder’, ‘c:\littlebitawesome’, [System.EnvironmentVariableTarget]::Machine)

CLOSE POWERSHELL AND REOPEN IT!!!

(get-item env:MyAwesomeTargetFolder).value

$List = New-Object System.Collections.Generic.List[System.Object]

foreach($User in $Users){

    ### Your processing code goes here ###

    $props = @{
        UPN = $User.User
        Type = $Type
    }
    $object = new-object psobject -Property $props
    $List.Add($object)
}

This is my second version of this as I more often want to create custom objects in a loop as the standard properties are missing something or I want to add a value from another query.
I’ve used $Users here as my input array as that’s what I most commonly have to use.

I’ve used a list here instead of an array as they are faster. You can append to a list. To add to an array you actually have to create an array one larger than the last array, populate it with the previous values and the the one you want to add.

Further reading: https://social.technet.microsoft.com/wiki/contents/articles/7804.powershell-creating-custom-objects.aspx

get-aduser -filter {(enabled -eq $True) -and (passwordneverexpires -eq $True)} -properties passwordneverexpires, enabled, description | select name,description

https://gallery.technet.microsoft.com/office/List-all-Users-Distribution-7f2013b2