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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for July 24th, 2020

Verifying large sets of file hashes with md5sum

Posted by jpluimers on 2020/07/24

A few tips:

  1. Recursively getting all md5 sums from a source directory:

    cd /sourceDirectory
    find -type f \( -not -name "md5sum.txt" \) -exec md5sum '{}' \; > md5sum.txt


  2. Checking the sums against a target directory

    cd /targetDirectory
    md5sum -c /sourceDirectory/md5sum.txt


On some systems (this was an ESXi system which can’t run stuff from the console in parallel), you could optimise this using xargs for the generation and GNU parallel for the generation and checking. Both should be very similar:

GNU parallel is written to have the same options as xargs. If you write loops in shell, you will find GNU parallel may be able to replace most of the loops and make them run faster by running several jobs in parallel.



Posted in *nix, *nix-tools, bash, Power User | Leave a Comment »

Science Fiction Writer Robert J. Sawyer: WordStar: A Writer’s Word Processor

Posted by jpluimers on 2020/07/24

20+ years old and still relevant: [WayBack] Science Fiction Writer Robert J. Sawyer: WordStar: A Writer’s Word Processor.

Besides doing a very quick and thorough introduction in the what and how of the WordStar keyboard shortcuts, he also explains a lot about the why.

Recommended reading, especially because of a user-experience perspective.

Markdown, Atom and Visual Studio code are not that different from WordStar.



Read the rest of this entry »

Posted in Development, History, Power User, Software Development | 2 Comments »


Posted by jpluimers on 2020/07/24

This is amazing stuff: it runs your C# code through a specific version (git branch) of the C# compiler!

C#/VB/F# compiler playground. Not a Shark lab.

Source: SharpLab




Posted in .NET, C#, Development, Software Development | Leave a Comment »

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