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Preview: John Bokma - freelance Perl Programmer

John Bokma - freelance Perl Programmer

John Bokma, a freelance Perl programmer living in Mexico


Docker for Mac Named Volume Speed Penalty


Based on some test I did today; importing a 10MB gzip compressed MySQL database dump, it seems that using a named volume is over twelve times slower than using bind mount on Docker for Mac version 1.12.1. When a named volume is used the data is stored into a virtual harddisk Docker.qcow2. Besides the [...]

Padding Numbers with Zero in Perl


Today I saw a piece of Perl code to format a date and time that uses what I consider a clusmy way to do zero padding. I have seen this method or a variation thereof before; it checks if a number is smaller than 10 and if this is the case it converts the number to a string, adding a zero in front of it. [...]

Getting Started with Docker for Mac


Today I finally was able to make some time to install Docker for Mac. Yesterday, in the evening I had already been rereading the first two chapters of The Docker Book by James Turnbull. This ebook is updated often and hence at 9.99 USD I consider this money well [...]

Updating an iPad Air 2 to iOS 10


Despite reported issues with upgrading to iOS 10 I decided to take the plunge today, and make an attempt to upgrade my iPad Air 2 to iOS [...]

Making iOS Notes available via iCloud


The iOS Notes app is one of the programs I use a lot on my iPad Air 2. Currently, I have 60 notes. Most of these notes are used to store web links, each note a specific topic. I really like how Notes renders links, and how easy it is to add new links from various apps to my [...]

Migrating Firefox from Linux to OS X


Today I migrated some of my Firefox settings from Linux to OS X. I decided to move only the settings I required instead of my entire profile, and install the extensions fresh even though just migrating the profile caused no issue when I migrated [...]

Migrating a Parallels Virtual Machine to VirtualBox


The 31st of August I removed Parallels Tools from a virtual machine running Ubuntu 15.10 because the grace period of 7 days, so "generously" given by Parallels after I didn't renew my subscription, had ended. Somehow this company considers it a smart move to make their software useless if one no longer [...]

Blocking unwelcome site traffic using iptables


After having generated an HTML report with GoAccess of this web site's current access log I noticed two IPs that had made a lot of requests to my site; and The top search in Google for the first IP address led to IP Reports for The origin of the IP address is the [...]

Fixing broken links in my RSS feed


Today, when reviewing the HTML site stats report made using GoAccess of this web site's current access log I noticed blog related URLs to the /blog/ part in the URL. [...]

Generating an HTML report with GoAccces


This month I started blogging again after a hiatus of over 4 years. Curious if my site was already getting more traffic, and to which pages, I wanted to make a report of my sites' access [...]

Migrating Thunderbird from Linux to OS X


Because Parallels Desktop has become practically ransomware; pay or you can't access your virtual machines anymore after a grace period of 6 days, I have some migration to do. To be honest, I have been thinking about this for quite some time, leaving Parallels behind. I bought a Mac mini and working [...]

When software subscriptions really suck


Today I was greeted by Parallels Desktop with a warning telling me that if I was not going to renew my subscription Parallels would stop [...]

Getting Started with Mac Ports


Some time ago, after having read about the advantages and disadvantages between Mac Ports and Homebrew I decided in favor of the former. I can't actually recall why exactly. It probably had also a little to do with my plans of running FreeBSD 11 on a fanless computer I bought ages [...]

Installing Git on OS X


Today I checked which version of Git was more recent, the Mac version on the official git site (2.9.2) or the version available via Mac Ports (2.9.3). Since the latter won, and also because I want to use Mac Ports for other software anyway, I decided to install Mac Ports [...]

Verifying the Weight of a Tyrannosaurus rex Skull


Today I read a post by the Tri-City Herald on Facebook regarding the arrival of a rare Tyrannosaurus rex skull at the Seattle museum. Besides the usual comments of creationists, mostly very confused about basic science, there was one person who considered the weight given a "big fish [...]

Emacsclient on Ubuntu


Over the past few days I have been using emacsclient to open files in an already running emacs in daemon (server) mode. Despite having been using Emacs for years I never got around to trying this out for a few days. And I really like it. So today I decided to switch my workflow to using emacsclient the [...]

The Docker Book Updated


Today I got an email from James Turnbull regarding an update of "The Docker [...]

Pandoc Resume LaTeX Template


Last week, from Wednesday until Friday; and even a little in the weekend, I have been working on an up-to-date version of my resume. The last version available for download hadn't been updated since 2004. Moreover, I was never really happy with it; too many [...]

Tar files located in another directory


Today I wanted to send some PDF files on blogging to a friend. I have those files in a "Blogging" directory which I can access using WebDAV with SSL on my iPad. I use this set up to sync PDF books to the GoodReader iOS app, which I can't recommend enough if you want to read PDFs on an [...]

Adding an extra column and a foreign key to a MySQL database table


A database table, part of a project I am currently working on, required an additional column with a foreign key. Because the database has already valuable data I couldn't just drop everything and start fresh, but had to alter the existing [...]

My non-fiction reading list for the rest of 2016


Back in April I ordered several books on Amazon, including three non-fiction books for myself. And back in June I ordered several more books on Amazon, including three more non-fiction books for [...]