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I'm currently a Postdoctoral Researcher at IBM Research Zurich. You can read more about my ongoing research here!
SOCKS proxy using ssh (with i3 integration)
From time to time, thanks to geoblocking or IP address based authorization, you need to access websites through a proxy. If you have access to a machine that would have the right address range or region, an easy and straightforward way is to use ssh: $ ssh -N -D 8180 <desired_machine> & i3 integration If you need this proxy more frequently and you want to have the status of the proxy connection displayed in your i3-status line (from the window manager i3wm), then you can integrate the proxy with the following scripts:
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#CaffeeLog #Linux
Search files with grep
In a programmers live, you need a recursive file search nearly every day. Of course, this is possible without a heavy IDE and with a simple but useful bash one liner: $ grep "pattern" -HniR ./path/to/dir The options in detail: H printing the filename of the match n print also the line number i for a case *in*sensitive search R for recursive Of course, this can also be combined with grep regular expressions.
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#CaffeeLog #Linux
Get H.264/MP4 codecs to work in Vivaldi Browser
I’m a happy user of the Vivaldi Browser. But every time after an upgrade, H.264 videos stop working and every time I search and try quite a while to get it working again…maybe because the solution is always to obvious. So, now I write it down in the hope of remembering it next time ;). 1) The easy (to obvious) option Execute vivaldi in a comand line! The output is something like:
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Add headers recursive on top of each code file
In various situations during the work on a project, it could happen that one is required to add a header to a lot of source code files. Since programmers are usually lazy — eh, interested to work efficiently — they won’t open every file and copy it manually. Once again, the Bash can help us. For example, a copyright notice in all C/C++ files: find . -name \*.{c,cpp,h,hpp} | xargs sed -i "1i/*Copyright .
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Spell checking in Vim
Mark Twain has been quoted as saying that he respected a person who could spell a word more than one way. Unfortunately, Twain’s enthusiasm for creative spelling isn’t widely shared today, at least in the professional world. (1) You know Vim already from a lot of features, including Macros, Reg Ex, or code formatting. Now, let’s add spell checking: Support for spell checking was added in Vim 7 and therefore it is really easy to activate:
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#CaffeeLog #Vim
New year, new blog!
Finally, I found the time and motivation to update my blog 0xCAFFEE.de. Since the initial setup of this blog in Joomla in 2015, I found a lot of lightweight but useful frameworks for websites and blogs and I slowly reconsidered my opinion over how to setup a good webpage. In the past, I preferred Joomla over Wordpress, because I liked powerful and feature-rich engine and I found for every idea I had for my webpage a suitable plug-in or component.
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FFMPEG: convert flac to mp3 and copy id3tags
And again something to ffmpeg: this very sophisticated tool can not only convert video or audio files. It also can handle the associated metadata. So, when you have a big music-library in the lossless format .flac (or .wav) and want to have it also on mobile devices you probably convert the files to mp3 or similar. Also, I do so, because when I’m travelling around I’ve mostly not the silence and equipment to hear music in best quality, so a little loss of quality through the use of mp3 would not be noticed.
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#CaffeeLog #Linux
FFMPEG using the H264 codec
I’ve often the “problem”, that I want to show a movie while traveling, but the mpg-file on my PC is a few GB big and the disk-space on my mobile Devices are limited. So, I want to convert my mpg-files to mp4 files, with less or no loss of quality, but a huge reduce of bytes. And every time I’m searching around the web to find the correct ffmpeg-options. In order not to search the next time I need it, I write it down:
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Recursive search in files on Linux
Sometimes I’m searching for a specific function in the many files and directories of a project. Of course, I could use heavy, often crashing and expensive IDEs to do this but there is one simple and fast method using the “boring” command line and the “ugly” tool grep: (Maybe I should note, that the “” in this case may mean some irony) grep -E -lir --include=*.{c,cpp,h,hpp} "void test()" The options:
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Courser highlighting and code formating in Vim
Every Programmer knows some of these very annoying situations: you have to edit someones code and he likes it to use really long lines you write in a language, which is sensitive to Indenting (e.g. Phyton, YAML) you have to read/edit someones code and he doesn’t now what Code Style means… So, to boils it down to one Point: You have trouble to because of bad code formating…
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#CaffeeLog #Vim