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How to diff two folders from a Windows command prompt

I was migrating files between two servers this weekend. One was our EMC VNX the other was a Nasuni filer. Nasuni has a built in migration tool using their web UI. It was working fine all week, but the night of the cut over it couldn’t complete a sync job. Since I had been syncing it all week I knew 99% of the files where there and correct. I wanted to find which files may have changed on Saturday morning. A quick google search and I found this syntax for robocopy it worked perfectly.

Diff Command Using RoboCopy

So here?s the command to perform a basic comparison of two folders and write a log file listing the differences.

ROBOCOPY “\\FileShare\SourceFolder” “\\FileShare\ComparisonFolder” /e /l /ns /njs /njh /ndl /fp /log:reconcile.txt

via How to diff two folders from a Windows command prompt | Improving Software.

Hope this helps someone else out. I found other solutions using powershell or 3rd party software. But this worked and was quick and easy.