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capture traffic to specific host over specific time

timeout 10h tcpdump -n -e host 127.0.0.1 -w /tmp/traffic_10h.log

get cumulated size from all traffic - tcpdump version 4.9.2

tcpdump -e -n -r /tmp/traffic_10h.log tcp | sed -r -E -n "s/(^.*, length) ([0-9]{1,4}):(.*)/\2/p" | awk '{sum+=$1; print sum}' | numfmt --to=iec-i --suffix=B --padding=7

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Add a Cross Compiled Kernel Module (Raspberry Pi)

I made the following notes while I was compiling a Kernel module (SI7020 Humidity/Temp Sensor) for the Raspberry Pi. The module was not part of the precompiled modules shipped with Raspbian. The steps should be the same if you want to build a different module.

I didn't want to install the Kernel headers or build modules on the Raspberry Pi.

Keep in mind, that a new module has to be build and installed once you update the Kernel!

Get Installed Kernel Version

Get the Kernel Version Tag

apt search raspberrypi-kernel
# raspberrypi-kernel/stable,now 1.20190819~stretch-1 armhf [installed]

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I'm using a 32.768 kHz Quarz to drive the async counter. This should work with the WDT as well.

void _pwrsave_sleep_asyn(uint16_t time) {
  uint16_t sleepCnt = time/8;

  cli();
  // switch timer2 to asynchronously mode
  // Disable the Timer/Counter2 interrupts by clearing OCIE2x and TOIE2
  TIMSK2 = 0;
  // Select clock source by setting AS2 as appropriate

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Setup

cd ~
curl -Ls https://gist.github.com/raw/32c5c7be014ed26039a864f077dbff6f/setup.sh | bash

Logout and in again to apply the changed groups!

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#!/bin/bash

# Installed Version
# modinfo nvidia | grep 'version:'
INSTALLED=`modinfo nvidia | grep '^version' | sed -r 's/version:.*([0-9]{3}\.[0-9]{2})/\1/'`

# Latest Long Lived Branch Version
AVAILABLE=`curl -s https://www.nvidia.com/en-us/drivers/unix/ | tr -d [:blank:] | \
    grep -A 2 'Linuxx86_64/AMD64/EM64T' | \
    grep 'LatestProductionBranchVersion' | \

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How to setup ssh through https tunnel

... via OpenSSL and Traefik

A HTTPS tunnel for SSH (Secure Shell) is a useful tool for accessing a remote server in a secure manner when the connection is limited or restricted by a firewall or network security measures. It provides a secure way to bypass these restrictions and access the remote server securely over the internet. The HTTPS protocol, which is used to secure web traffic, is utilized to create a secure connection to the remote server. The data transmitted over this connection is

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#!/bin/bash

: '
Description: Canon CR2 to HEIC Converter

This Bash script automates the process of converting Canon CR2 raw image files to High-Efficiency Image Format (HEIC) files with a 16-bit color depth. The conversion is achieved using `dcraw` for raw file processing, preserving the intricate details captured by Canon cameras. Additionally, `exiftool` is employed to extract and retain Exif metadata, ensuring valuable information about the images is maintained.

Features:
- Converts Canon CR2 raw files to HEIC format.
- Utilizes `dcraw` for high-quality raw file conversion.