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This is certainly preferable since it avoids the problems the first solution offers as identified in the comments uses a stream, closes it, and supports large files. Thanks to davor above for the suggestion to use Open instead of ReadAllBytes and to jpmc26 for the suggestion to use a finally block. There are a lot of examples online using ComputeHash. My testing showed this was very slow when running over a network connection. The snippet below runs much faster for me, however YMMV:.
It uses the. NET framework to instantiate an instance of the MD5 hash algorithm to calculate the hash. Another built in command that's long been installed in Windows by default dating back to is certutil, which of course can be invoked from powershell, too.
This question is almost 3 years old, since then, as some commented, there is a Get-FileHash function wich is very handy. I guess this answer is redundant of keith-hill answer and the edition of the chosen answer, but it points to official documentation and it has a better example. The documentation has more examples.
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