Powershell

PowerShell hash tables are, by default, not case sensitive: PS > $hash = @{} PS > $hash.Key = 1 PS > $hash.keY = 2 PS > $hash.KEY 2 If...

You can try this to create a new empty byte array with 100 bytes: $byte = New-Object Byte[] 100   Try this if you need to create a byte array...

If you want to quickly exchange a file extension to create a "bak" backup version or generate a new file name for output, you should use...

In a previous tip, we showed you how to group using your own criteria. Group-Object can also auto-create hash tables so that you can easily create...

Try using Group-Object to group objects by any property: PS> Get-Process | Group-Object -property Company You can also submit a script block and...

In a previous tip, we showed you how to parse text-based log files using the PowerShell pipeline. However, the pipeline has considerable overhead....

Extracting useful information from huge text-based log files isn’t necessarily  a difficult task. Check out this line: PS> Get-Content...

Sometimes, classic tools like ipconfig.exe can yield useful information that you'd like to integrate with PowerShell. Here is sample code that...

Here is a useful function that you can use to calculate the total size of a folder: function Get-FolderSize($path) { Get-ChildItem $path -Recurse...

You can use Get-WMIObject to create a high-level hardware report. Instead of submitting a specific device class name, you should use a generic...

Once you create a hash table, it is easy for you to add new key-value pairs like this: PS > $myHash = @{} PS > $myHash.Name = 'Tobias'...

You can use Copy-Item to quickly copy entire structures of registry keys and sub-keys in a matter of milliseconds. Take a look at this example...

You may sometimes get "Access Denied" exceptions, even though  you have Admin privileges and used an elevated shell. For ...

The [RegEx] type has a method called Replace(), which can be used to replace text by using regular expressions. This line would replace the last...

If you would like to check the implications of stopping  a service, you should have a look at its dependent services: (Get-Service...

Check out this line to determine when an installation required a system restart: Get-EventLog -InstanceId 1038 -LogName Application | ForEach-Object...

In a previous tip, you learned that Select-Object can find multiple matches. Here is a function called matches. You can submit a regular expressions...

When you want to find matches based on regular expressions, PowerShell will only support the -match operator which finds the first match. There does...

Sometimes, you may need to have the event ID for a system event, though what you really need is the instance ID. For example, Get-EventLog will only...

Search for the appropriate events in your event log to discover when Windows has validated your license: get-eventlog -LogName Application...

Check out this line to visualize when your system defragmented your hard drives: get-eventlog -LogName Application -InstanceId 258 | ForEach-Object...

Windows Update and Software installations will frequently create system restore points. Run this to get a list of such events: Get-EventLog -LogName...

PowerShell will keep a history of the commands you entered and then you can list the history with Get-History, configuring the maximum length of...

When you need to handle errors created by native commands, you can use a wrapper function like Call. It will automatically discover when a native...