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In The Spotlight. Shop Our Brands. In the PowerShell console, execute a command to generate an error such as Get- Item foo. Understanding PowerShell ScriptingHow it works In the first step, we create a function that takes two numbers, multiplies them, and returnsthe result. As we see in the second step, the function operates normally as long as twonumbers are presented, but if something other than a number is presented, then anunfriendly error is returned.
The Try block attempts to perform the multiplication, and if an error is returnedthen processing exits. When the Try block fails for any reason, it then executes the Catchblock instead. In this case, we are returning a command specific error message, in otherscenarios we could initiate an alternative task or command that was based on the error. These errors are only removed from the array when it reaches its maximum size, or when the user session is ended.
Count This example starts by returning the number of items in the array. Clear is called to empty the array. Lastly, the number of array items is returned to confirm that it has been cleared.
This is the default action. Not all errors will be suppressed. Therefore the question is not always how to accomplish a task, it is howbest to accomplish the task. Often times the answer comes down to how fast a certainmethod performs. In this recipe, we will look at different methods to retrieve the local groups on a memberserver. The different methods will be benchmarked to determine the optimal method.
Getting readyIn this example, we will be listing the NT groups on the local computer. This class however, returns all local computer groups,as well all domain groups. If you have a domain environment with a large number of groups,this process can be extensive. Understanding PowerShell Scripting 2. Benchmark the first task using Measure-Command: 3. Benchmark the second task using Measure-Command:How it works Both of these commands perform the same task, querying WMI for local groups on our server.
Both commands result in returning the same data,so this suggests the second method is more ideal for my current situation. Additionally, the subordinate CA types are child authoritiesthat have been delegated permission from the root authorities to create certificates. There's more…Once the PKI environment is implemented, the next step is to create a group policy to haveclients autoenroll.
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Unfortunately, there is not a built-in function to edit the group policy objectswe need, so we have to perform the task manually. Following are the steps necessary to setup the autoenroll GPO: 1. Right-click on Default Domain Policy and select Edit Creating AD usersWhen working in a test or lab environment, it is useful to have a number of test accounts touse. These accounts can have different access permissions and simulate different types ofusers doing specific tasks.
These AD users are normally made up of simple accounts with acommon password. Additionally, when setting up a new production environment, it may be necessary to populateusers into AD. These usernames and e-mail addresses are predefined and the passwordsmust be unique.
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In this recipe we will use a PowerShell script to create both types of users. Chapter 2Getting readyTo use this recipe properly, you need an AD environment with credentials capable of creatinguser accounts.
Additionally, if you want to create specific users, you will need a CSV file withheaders of LastName,FirstName as shown in the following screenshot that contains theusers to create:How to do it Carry out the following steps to create AD users: 1. Chapter 2How it works The loading of the CSV file has no error checking included, so it is important to review the contents of the file before starting. Specifically, confirm that the first line has the column headers as expected.
(Reference Guide) Windows Server Automation with PowerShell Cookbook - Second Edition
Once the user list has been determined, each user account is cycled through. Additionalaccount properties, such as the e-mail address and username, are populated based on userinformation, and if a password was not predefined, a random password is generated. Oncethe password is defined, then Create-User is called. It then converts the password into a secure stringthat can be used when creating the user account. Lastly, New-ADUser is called to create theuser account in Active Directory with the defined user properties, and the user information isechoed to the console.
The third function named Get-RandomPass uses a loop to create a 10 random characters,which are combined and returned as a random password. Once 10 characters have been added to the variable, the results are returned towhatever called the function. This password generator is very basic and may not meet your organization's complexity requirements.
If this occurs, the account will still be created but will be disabled. A new password can be applied at a later time that meets the necessary complexity requirements.