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

sepastian

# Grab video from a camcorder using dvgrap, 
# convert to h.265 encoded video using ffmpeg.
#
# https://trac.ffmpeg.org/wiki/Encode/H.265
# https://regx.dgswa.com/html/content/dvgrab-ffmpeg-capture-compression

dvgrab --format dv1 --rewind - \
  | ffmpeg -f dv -i - \
    -vf yadif \
    -c:v libx265 -crf 26 \

sepastian

# DEPRECATED: 
# In addition to running Python code, the coderpad console allows 
# to pip install packages as well:
#
# >>> pip install sortedcontainers
#
# Using the code below is not required.
# It will be kept here for reference, as it shows how to access
# the Coderpad environment.

sepastian

#include <set>
#include <iostream>
#include <vector>

/*
 * How to order a set<vector<A>::iterator>.
 */

struct A
{

sepastian

# https://germandiagogomez.medium.com/getting-started-with-meson-build-system-and-c-83270f444bee

# Create project directory.
mkdir new_project
cd new_project

# Create source file.
echo "int main() {};" >> main.cpp

# Init meson, setup meson.

sepastian

Environment

$ uname -a
Linux x220 6.3.0-1-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.3.7-1 (2023-06-12) x86_64 GNU/Linux

List Cameras

sepastian

#!/bin/bash

set -euo pipefail

# Find files created within 1 days (`-ctime -1`);
# convert (Nikon/NEF) RAW images to PPM using dcraw;
# write results to stdout with -c;
# convert stdin to JPG using Imagemagick's convert;
# specify format of input image with 'ppm:-'.
find /path/to/sdcard/ -name '*.NEF' -ctime -1 \

sepastian

From: https://cromwell-intl.com/open-source/performance-tuning/file-systems.html.

Mount Parameters

Disable recording of access times when mounting the FS.

For example, find with access times enabled would upate the access time of every file found.

# /etc/fstab

sepastian

# Oh-My-ZSH custom function to record left monitor from CLI.
# 
# Place in $ZSH/.oh-my-zsh/custom.
#
# Two monitors at screen 0, the left one connected at DP-1:
#
#     xrandr 
#     Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 16384 x 16384
#     DP-1 connected primary 1920x1200+1920+0 (normal left inverted right x axis y axis) 518mm x 324mm
#       1920x1200     59.95*+