Wildcards in Windows

I put forth the challenge in my last post about how to match files that start, end, or simply have a period in them. It isn’t easy to do. Wildcards in paths seem simple at first. You have ‘?’ to match any single character and ‘*’ to match zero or more of any characters. Matching…

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Wildcard challenge

Finding files with spaces from a command prompt might not be immediately obvious. Using quotes is the answer. List all files with a space: dir “* *” List all files that start with a space: dir ” *” List all files that end with a space: ??? #3 is a bit more challenging. Normalization has something…

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More on new .NET path handling

In my prior post I talked briefly about the new path handling in .NET 4.6.2. In the latest drop (14367) PowerShell opts into both of the new behaviors so you can easily play around with the changes. There are two basic changes that can be controlled via two compatibility switches. The changes both originated in…

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New .NET path handling sneak peek

As mentioned I’m going to do the On .NET show in a couple weeks to talk about path changes in .NET. In the meantime, a little bit of fun for you if you’ve got the latest (14361) fast ring build for Windows 10 Anniversary Update… UPDATE: In the latest drop (14367) PowerShell opts into the new…

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Long paths in .NET

The answer is yes, we have done work to support long paths in Windows. As Windows unblocks MAX_PATH scenarios you’ll be able to take advantage with your .NET 4.6.2 applications. I plan to talk about what we’ve done with paths in both .NET Core and .NET 4.6.2 on an upcoming On .NET talk on June…

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DOS to NT: A Path’s Journey

Overview Most of us are familiar with DOS style paths to files such as C:\bar\foo.txt. Most aren’t familiar with the DOS Device format of said path: \\.\C:\bar\foo.txt. Even less know about the lowest level version of this path- the “real” NT path to the file object that Windows uses internally: \Device\HarddiskVolume4\bar\foo.txt. Knowing how paths resolve through the…

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Path Normalization

Here is part two of my discussion on Windows paths- the normalization of paths. See the first post at Path Format Overview. Important: Some things I discuss aren’t explicitly or centrally documented. While you can discover these details by thorough searching and experimentation, be very cautious of second guessing Windows APIs. If you need functionality a…

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Path Format Overview

As promised, here is the start of the look into paths on Windows. I’ll keep things simple at first and layer on complexity in additional posts. In this post we’ll look at a top level overview of the path formats in use in Windows. DOS Paths Let’s start with the DOS path format that has…

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