Using ssh-keygen
ssh-keygen is a very handy tool for managing ssh-keys. By far the most common use of ssh-keygen is for generating ssh-keys. But this tool can do a bit more..
Fairphone2 has a problem with 2 sim cards
Today I inserted another sim card in my fairphone 2. I want to use LTE with this card, but I wasn't able to configure 4G/3G/2G. 2G was selected and the button was disabled. So I just had 2G. The other card worked as expected and I was able to choose 4G/3G/2G. This bothered me the whole day.
In the evening I figured out how to fix the problem:
Installing cronjobs out of scripts
Sometimes it's necessary to install cronjobs out of scripts. It's not a good idea to directly write to /var/spool/cron/crontabs. Various things might happen like permission problems or simply problems with the format. It's better to make this in two steps.
Weather in...
http://wttr.in is a very nice Weather-Site. It's possible do download the result via curl in a colorful format for the command-line:
Tiva cc3200: Get serial port working under Linux
Tiva cc3200 is a small board with an integrated wifi-chip. The Linux-kernel needs a few configs to be able to talk to this board using a serial console( via usb):
Recording terminal-sessions
Recording any terminal session to a gif is easy. I use ttyrec to record a session and ttygif to convert it to GIF.
Starting vim in english
There are plenty of settings for the language in vim. Regarding to vim's documentation there is a very simple way to set the language for a vim-session to english:
env LANG=en_US.UTF-8 vim
End-To-End-Encryption for messengers
End-To-End-Encryption is nothing new. With messengers like Whatsapp or Telegram it's again an issue. If E2E-Encryption means that nobody but the endpoints are able to encrypt the messages, then how is this feature implemented so seamlessly?
Perf - More than just counters
Perf is a profiler tool for Linux 2.6+ based systems that abstracts away CPU hardware differences in Linux performance measurements and presents a simple commandline interface. Perf is based on the perf_events interface exported by recent versions of the Linux kernel. This article demonstrates the perf tool through example runs.
Duplicity: restore the state of a file from a specific date
Duplicity is a powerful backup-tool for encrypted incremental backups to a local or a remote storage. In this article I will describe how to recover a state of a file from a specific date...