sepastian

# Annotate images with respective filename.
# Note: quotes must be escaped, or parallel will 'swallow' them...
find height_1000 -type f -name '*png' \
  | parallel convert \
    -verbose \
    -background \'#0009\' \
    -gravity center \
    -fill white \
    caption:\"{/}\" \
    {} \

sepastian

# Customize colors in Emacs with M-x customize-face.
#
# From: https://stackoverflow.com/a/41840175/92049

sepastian

# Use a DSLR camera as a webcam, in Zoom and other applications.

# Inputs from https://gist.github.com/ianmackinnon/cf8a4d6cdb08852a818fc34bd4e1882f
# See # https://gstreamer.freedesktop.org/documentation/video4linux2/v4l2sink.html?gi-language=c#v4l2sink

# Install dependencies.
sudo apt install v4l2loopback-dkms gphoto2 gstreamer1.0-tools

# Load and verify module.
sudo modprobe v4l2loopback

sepastian

#!/bin/bash

set -euo pipefail

unzip file.zip

# Show what would be renamed.
convmv -f cp-1521 -t urf-8 *

# Do the renaming.

sepastian

#!/bin/bash

set -euo pipefail

# Record the screen into an h264 encoded MP4.
# Determing video resolution from the screen being recorded.
#
# Required gst-launch and xrandr.
#
# Based on https://stackoverflow.com/a/33822024/92049

sepastian

# Record audio that is currently output.
# From https://askubuntu.com/questions/229352/how-to-record-output-to-speakers
sudo apt-get install pulseaudio-utils lame mpg123
pacmd list-sinks | grep -e 'name:' -e 'index' -e 'Speakers'
parec -d alsa_output.pci-0000_00_1f.3.analog-stereo.monitor | lame -r -V0 - out.mp3
# ctrl + c to stop recording
mpg123 out.mp3

sepastian

# SSH into remote host "R", startup Jupyter on port XXXX.
ssh [email protected]
jupyer notebook --no-browser --port=XXXX

# On the localhost "L", accessing jupyter via the browser:
# create a reverse tunnel, forwarding YYYY (L) to XXXX (R).
ssh -N -L YYYY:localhost:XXXX [email protected]
          ---- --------- ----
            |       |      |
            |       |      ` port on remote where Jupyer is listening

sepastian

#!/bin/bash

# Current directory contains a folder named 'img', 
# which contains images nested in subfolders, e.g.
#
# img
#   folder1
#     img1.jpg
#     img2.jpg
#   folder2

sepastian

# Using go get can be confusing, here's what I learned.
#
# When go get ./... failed in a Dockerfile on Dockerhub, I listed and installed dependencies manually.
# Inspired by https://dave.cheney.net/2014/09/14/go-list-your-swiss-army-knife
#
# Recursively search for dependencies in $GOPATH/src; install dependencies using go get.
find "${GOPATH}/src" -type d \
  -exec go list -f '{{ join .Imports "\n" }}' -e {} + \
  | sort -u \
  | xargs go get -v

sepastian

# First, install certificate with https://www.zim.uni-passau.de/dienstleistungen/netzwerk-und-server/netzwerkzugang/eduroam/fuer-uniangehoerige/linux/
# This will created ~/.cat_installer/user.p12 and ~/.cat_installer/ca.pem, which are the certificates required to connect.

# Create eduroam config for wpa_supplicant.
# ZIMID is your ZIM identifier, e.g. abcdef99
cat > /tmp/eduroam.conf <<EOF
network={
  ssid="eduroam"
  key_mgmt=WPA-EAP
  pairwise=CCMP