sepastian

To enable screen capture in OBS under Wayland, install wlrobs.

Follow the instructions found here.

(Install mercurial first, if required.)

# clone and compile
hg clone https://hg.sr.ht/~scoopta/wlrobs
cd wlrobs

sepastian

When maintaining code and, successively, building old (10+ years) Dockerfile images, problems may arise because the base image may be based off a Debian distribution, which is no longer available. I.e. /etc/apt/sources.list cointains references, which no longer exist. For example, ruby:2.3 is based off Debian 9 (stretch), as can be seen.

# # cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"

sepastian

sudo apt install supercollider
pw-jack scide # start supercollider IDE using Pipewire-Jack

# Inside the IDE, test that things are working:
s.boot
{ [SinOsc.ar(440, 0, 0.2), SinOsc.ar(442, 0, 0.2)] }.play; # Ctrl+Enter
                                                           # Ctrl+. to stop playback

sepastian

# 1. Install official Linux drivers from Brother
#    e.g. https://support.brother.com/g/b/downloadtop.aspx?c=us_ot&lang=en&prod=ds640_us_eu_as
  
# 2. Install sane-utils (Debian)
sudo apt install sane-utils
  
# 3. Connect scanner, list available scanners
scanimage -L
# device `brother5:bus2;dev2' is a Brother DS-640 USB scanner

sepastian

# Given a comma-separated list of strings,
# quote each string separately in double-quotes
# for exampe, for using the list of strings in Python.
#
# Use sed to replace word boundaries (\b) with a quote character (").
head -1 some_csv_file.csv | sed -e 's|\b|"|g'

# head -1 topic_to_policy_llm_CORRECTED.csv 
# topic_id,match,policy_field_flo,policy_field_llm,topic,source,policy_id_llm

sepastian

# Find PDFs, for example in sorted order,
# using https://gist.github.com/sepastian/5a39eb7aff7adcf2ba2460ca0738664a
find -type f -name '*pdf' | \
  while read f
  do
    # Append file 2 ... N
    if [ -f all.pdf ]; then
      ~/go/bin/pdfcpu merge -m append all.pdf "${f}"
      continue
    fi

sepastian

# Use the `sort` command to sort by German month names.
#
# E.g. sort files containing month names in ther path.

# make sure desired locale is installed
$ localectl list-locales
C.UTF-8
en_US.UTF-8

# install missing locales, if required

sepastian

This guide describes how to setup networking under Debian Linux on a laptop. While there are many options to choose from, Debian 12 (bookworm) uses NetworkManager and wpa_supplicant as a default. This guide installs systemd-networkd and iwd, with the goal of controlling networking form the command line, using modern components.

The official Debian documentation lists various options and serves as a starting point.

NetworkManager → systemd-networkd

Replacing NetworkManager with systemd-networkd has been done following the official Debian docs and a great guide by Fernanto Cejas.

sepastian

# Activate  Python venv when changing into directory containing .venv/bin/activate; 
# deactivate Python venv when leaving directory containing .venv/bin/activate.
#
# Handle edge case, where presend and new directory contain .venv/bin/activate,
# i.e. switching from one venv into the next.
#
# This works for Bash only, place at the end of ~/.bashrc.
#
# Based on https://unix.stackexchange.com/a/170282                                                                                                
cd() {

sepastian

#!/bin/bash

set -euo pipefail

# Select all objects which do not contain an attribute named 'message'.
#
# Background: a log file contains messages from an application and
# numerous messages from Mongo db; the messages from Mongo contain
# an attribute called 'message', the application logs contain 'msg'
# instead. Filter the application logs only by selecting all objects