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Return of the missing PSDiagnostics members in PowerShell v6.2 preview 3. In Windows PowerShell v5.1 the PSDiagnostics module contains these members: In PowerShell v6.2 preview 3 we’re back to the original set: NOTE: this is just on Windows – I don’t have a non-Windows machine to determine what’s available on  non-Windows platforms Staying with our current theme of manipulating strings this is how you find duplicate characters in a string. Convert the string to a char array, group on the characters and use Where-Object to filter the characters that occur more than once – Join-String is a new cmdlet in PowerShell v6.2 preview 3. Join-String enables you to use the pipeline to join strings. You can use the property of objects on the pipeline as a source for the data: The current culture can also be use to influence the string. For instance dates: To me the string version of the date reads  12 November 2018 not 11 December 2018 so I need to use my culture I suspect that Join-String will become one of those cmdlet that has many, many uses. For instance an easy way to create sequential file PowerShell v6.2 preview 3 install issue – PowerShell v6.2 preview 3 is now available from When you click on the icon to start preview 3 the console will flash open and then immediately close. The fix is to either uninstall preview 2 before installing preview 3 OR install preview 3 over the top of preview 2 and immediately rerun the preview 3 installation selecting the repair option. The install will work through and then PowerShell v6.2 preview 3 will work. the underlying cause is understood and hopefully will be fixed in a later release Last time I showed how to get the number of occurrences of each character in a string but how do you count the occurrence of given You use one of the fundamental concepts on which PowerShell is built – its composability. In other words PowerShell is composed of a lot of very small pieces of code that each do its own job and you select and as*emble the components  you need to complete a given task.