But what it will be returning is a text stream, so we’ll have to parse that so we can break it up into a custom object we can use it. Including simply listing the files present in folder structure. Robocopy is an amazing copy utility that will copy file structures, mirror two folders (even deletions), maintain ACL’s and a whole host of other things.
Finally in Windows 2008 Microsoft started packaging Robocopy with Windows instead of making you download it in a toolkit separately. Robocopy is a long-standing utility that has been around for a very long time. So if we want to limit how much data we’re getting–usually because we don’t need all of it–we have a couple of techniques that will get us very basic information about directory structures very quickly. All of this takes time and when you start working with truly massive file structures speed starts to become an issue. And then there are a number of other properties that have to be populated.
That means Get-ChildItem has to convert them–and there are about 6 different dates that have to be converted. Net Date/Time objects, but some other format. So the dates that are in the file system object are not.
When the file system was original created many of the object types that we use every day didn’t exist. Too much data! This isn’t really a problem so much as a consequence of what the cmdlet is doing.Net file handling classes, which don’t support long files names–so nothing more than 260 characters in length. This might be your first question, and it’s a really good one! The core problem is Get-ChildItem isn’t the most performant cmdlet in your PowerShell toolkit, and let me outline a couple of problems with it. But are they faster? And if so, which one? Nicolas1847, a PowerShell scripter on Spiceworks, has come up with an ingenious method to get simple directory information using Robocopy (of all things), and a colleague at athena health likes to shell out to CMD.exe and use the old DIR command. One piece I’ve never been able to speed up, though, is iterating through folders and files. This has turned out to be a good habit now that I’m working at athena health, as the pure scale of things is so much larger than places I’ve been at in the past. By now, you may have noticed I’m always on the lookout for better performing code.
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