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Articles about howto

  1. PDF tricks

    This article contains several useful tricks for manipulating PDF files.

    The focus of this article is on Open Source and Free software, that are available for UNIX-like operating systems. These tools are made for use on the command-line of a shell.

    Adding password restrictions to a PDF file

    PDF …

  2. Adding text or graphics to a PDF file

    Using Acrobat Reader’s ability to add text et cetera has proven unreliable for me. On multiple occasions I have lost all the text added to a PDF file. When your filling in 20-plus pages worth of permit forms this is a huge waste of time and extremely annoying.

    So …

  3. Installing asymptote 2.38 in TeXLive 2016

    Since the previous article [1, 2] I’ve updated TexLive to 2016. This comes with asymptote 2.38, but not with a FreeBSD binary for it.

    My TeXLive is not installed from the FreeBSD ports tree, so I cannot use the asymptote port since it depends on the TeXLive port …

  4. Reading xlsx files with Python

    This article is a write-up of what I learned trying to extract information from ms-office xlsx files using Python.


    For my work I need to keep track of the hours that I spend on projects. Traditionally this is done on pre-printed paper sheets. This is somewhat cumbersome and the …

  5. Using a scanner for macro photography

    Although you wouldn’t guess it from the contents of this blog, my day job involves the design and production of products from fiber reinforced composites. A lot of my projects fall under non-disclosure agreements, so I cannot discuss them here.

    What I can do is share some of the …

  6. Using a Sony PRS-T2N e-reader with FreeBSD

    This article describes how to mount and transfer files to a Sony PRS-T2N.

    In an earlier article I reviewed the Sony PRS-T2N. It seems this model has now been replaced by the PRS-T3, and Sony has stopped making E-readers.

    Nevertheless I want to document how to mount …

  7. Checking links with linklint

    This website contains lots of external links. A fact of life is that hyperlinks are subject to change, so they need checking every now and then.

    In this how-to article I’ll cover how I did that for this website.

    While doing some checking on older articles on my weblog …

  8. Making a subset of a git repository

    Since I am in the process of making most of my programs available on github, I have been re-shuffling the some git repositories. Especially my collection of scripts (small programs for different purposes). Because some of those scripts are private, I don’t want to publish that repository as a …

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