Neither one nor Many

August 28 2020

This is just to have some list somewhere, sorted from newer to old.

Multi-threading Talk

Work in progress..

Creating a composable class with C++14 variadic templates

This was a lightningtalk I prepared.

CAF C++ Actor Framework - Intro & Demo

This was a lightningtalk I prepared.

Workshop DDD summary

Since I went to a DDD / Event storming workshop decided to summarize some learnings and present to collegues.

Some rant about the IDAR method !nl

Linux commands !nl

Created this talk more for collegues that wanted to become more familiar with the linux shell.

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September 3 2019

This is mostly for keeping track of what equipment I have, and to keep notes regarding my drones, or drones in general.

A few years ago I got interested in soldering, later in electronics, later in arduinos, then 3D printing, and now a new hobby that is made possible thanks to all this.

It took a while to learn the basics, and now I finally reached a level where I can at least compose my own drones and build them from scratch.

TinyTina 90mm 3D printed drone

This whole mess started with ordering parts for: I pretty much stuck with all the recommended parts, see

Flight controller + ESC board HGLRC XJB F413 Omnibus F4 Flight Controller & 13A Blheli_S 2-3S... url 52.71 EUR
Motors Racerstar Racing Edition 1103 BR1103B 8000KV 10000KV 1-3S... url 7.43 EUR
Propellers 5 Pairs Eachine 2035 50mm 4 Blade Propellers ABS For Eachine... url 3.21 EUR
Battery Giant Power 7.4V 300mAh 2S 35C Battery For HCP100s T-REX 150 F3P url 5.33 EUR
Battery charger Charsoon Lipo Charger url 12.50 EUR
Radio Transmitter FlySky FS-i6 2.4G 6CH AFHDS RC Radion Transmitter With FS-iA6B... url 38.42 EUR
Flysky Receiver FS-RX2A Pro V1 2.4G Compatible Receiver for FS-I6 FS-I6X FS-I6S... url 7.35 EUR
Connector for battery 5 Pairs 100mm 10cm JST Male And Female Plug Connector Cable ESC... url 1.49 EUR
Connect receiver with flight controller Foxeer XAT600M 4Pin Servo Cable url 1.02 EUR
Frame 3D printed -
FPV goggles Eachine VR D2 Pro 5 Inches 800*480 40CH 5.8G Diversity FPV... url 66.13 EUR
FPV camera + built in transmitter Eachine TX05 0.01/5/25/50/100/250mW Switchable w/ OSD AIO 5.8G... url 23.22 EUR

Eachine Wizard x220 (M.I.A.)

Almost ready to fly wizard x220 Eachine Wizard X220 FPV Racing RC Drone Blheli_S F3 6DOF 2205... url 117.06
Receiver (already had it, came with transmitter) Flysky 2.4G 6CH FS-iA6B Receiver PPM Output With iBus Port url 13.55 EUR
3S batteries used most ZOP Power 3S 11.1V 1500MAH 25C Battery XT60 Plug url 11.54 EUR
FPV Camera (upgrade) caddx turtle v2 (special lens) url 63.95 EUR
VTX (upgrade) Eachine TS5828L Micro 5.8G 600mW 40CH Mini FPV Transmitter VTX... url 8.79 EUR
Antenna (upgrade) AOMWAY 5.8G 3dBi RP-SMA Male Four Lobe RHCP VTx/VRx FPV Antenna url 10.75 EUR
Custom camera mount 3D designed + printed -

Propeller upgrades

Stock propellers broke too easily, you could see the plastic get "tired" quickly. The DAL props really where indestructable compared to the stocks.

Tri blades DAL Cyclone T5045C Propellers (4 stuks) - BLAUW url 2.49 EUR
Bi blades DAL 5045 Indestructible Bullnose Propellers - Groen (4 stuks) url 1.95 EUR

Other batteries

3S WLtoys V950 RC Helicopter Part 1500mAh 11.1V 20C 3S T Plug Lipo... url 16.42 EUR
4S Tattu LiPo accupack 14.8 V 1300 mAh Aantal cellen: 4 45 C Softcase XT60 url 20.49

Only flew the 4S battery once, which was when I lost the drone


Replacement ESC (one burned probably shorted with the frame) Aikon SEFM 20A 2-4S ESC url 12.95 EUR

This ESC after configuring the same settings as the three remaining stock ESC's worked perfectly together, even though it's a different one. The quad flew perfectly fine.

Awesome E90 build

Frustrated with failures trying to build the TinyTina, trying different motors, different flight controller, it just didn't work well with the 3D printed frame anymore. It flew, but then it would bend and the props would hit something. So I looked for a more sturdy frame.

Frame Awesome E90 90mm Micro Brushless Frame Kit Carbon Fiber 12g RC Drone FPV Racing Frame Multi Rotor url 10.32 EUR
Motors Racerstar Racing Edition 1103 BR1103B 8000KV 10000KV 1-3S Brushless Motor Black For 50-100 RC Drone FPV Racing - 8000KV url 7.34 EUR
Flight controller Aikon F42020 Flight Controller url 32.95 EUR
4-in-1 ESC AIKON AK32PIN 25A 2-6S 4-IN-1 ESC url 53.95 EUR

The following parts are identical to the TinyTina build.

Flysky Receiver FS-RX2A Pro V1 2.4G Compatible Receiver for FS-I6 FS-I6X FS-I6S... url 7.35 EUR
Connector for battery 5 Pairs 100mm 10cm JST Male And Female Plug Connector Cable ESC... url 1.49 EUR
Propellers 5 Pairs Eachine 2035 50mm 4 Blade Propellers ABS For Eachine... url 3.21 EUR
FPV camera + built in transmitter Eachine TX05 0.01/5/25/50/100/250mW Switchable w/ OSD AIO 5.8G... url 23.22 EUR

Different batteries though, the battery wasn't powerful enough. Bought a few 450mAh with 20C, 45C. Turns out the 45C was the only one that was able to lift it off the ground. Now I did some redesigns and it became heavier, and now it won't come off the ground again with 45C, also not with an 80C 450mAh 2S battery. I have to troubleshoot the bottleneck now, either the props should be bigger (plenty of space, since I moved the entire stack below the frame), or the battery needs to be 3S, OR the capacitor has to go (I think it's recommended for 6S usually anyway, and maybe the soldering joints for the battery are not perfect).

Batteries tried

Conrad energy LiPo accupack 7.4 V 450 mAh Aantal cellen: 2 40 C Softcase BEC-bus url 9.55 EUR
Gens ace LiPo accupack 7.4 V 450 mAh Aantal cellen: 2 25 C Softcase BEC url 7.39 EUR
Conrad energy LiPo accupack 7.4 V 350 mAh Aantal cellen: 2 25 C Softcase BEC-bus url 4.77 EUR
5Pcs Gaoneng GNB 7.4V 450mAh 2S 80/160C Lipo Battery JST Plug For Eachine Aurora 90 100 FPV Racer url 27.88 EUR


Remapping motors

Long m2 screws

General information

In cli

resource list

resource motor 1 a7 resource motor 2 a12 resource motor 3 a6 resource motor 4 a11 save

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December 18 2018

Testing and coverage


  • go test
  • go test -cover

    go test -cover -coverprofile=c.out go tool cover -html=c.out -o coverage.html

If you have main.go, add main_test.go:

package main

import "testing"

func TestSum(t *testing.T) {
    total := Sum(5, 5)
    if total != 10 {
       t.Errorf("Sum was incorrect, got: %d, want: %d.", total, 10)

More info here:


Source: (by Ross Cox)

var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
func main() {
    if *cpuprofile != "" {
        f, err := os.Create(*cpuprofile)
        if err != nil {
        defer pprof.StopCPUProfile()

Build an capture profiling data

  • go build && ./myprogram
  • go tool pprof myprogram

Commands available are:

  • top5
  • top10
  • top10 -cum
  • list main
  • list myfoobar.function.func1

There are also very similar flags for memory profiling. I didn't try this myself yet, check the blog I got this from in the first place.

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June 12 2018

list GPU allocatable resources

kubectl get node -o go-template='{{printf "%-40s %20s %20s\n" "NODE" "CAPACITY" "ALLOCATABLE"}}{{range $index,$pod := .items}}{{$capacity := index .status.capacity ""}}{{$alloc := index .status.allocatable ""}}{{printf "%-40s %20s %20s\n" $capacity $alloc}}{{end}}'

list all api resources

kubectl api-resources --verbs=list --namespaced -o name 

# useful for debugging
kubectl api-resources --verbs=list --namespaced -o name | xargs -n 1 -I{} /bin/sh -c "kubectl get {} -o yaml || true; kubectl get {} --all-namespaces -o yaml || true"| tee out.log

ping all pod ips at once

kubectl get po -o json | jq .items[].status.podIP -r | fping

Force delete stuck namespace

kubectl get namespace "foo-restricted" -o json \
        | tr -d "\n" | sed "s/\"finalizers\": \[[^]]\+\]/\"finalizers\": []/" \
        | kubectl replace --raw /api/v1/namespaces/foo-restricted/finalize -f -

Run pod in namespace

kubectl run -i --tty busybox --image=busybox:latest --restart Never --rm -n $NAMESPACE -- sh

Selecting pods

kubectl get pod -A
kubectl get pod --show-labels
kubectl get pod -l foo=bar,baz=ban

Deleting pods

No time to waste?

kubectl delete pod --grace-period=0 --force

Clean up

Cleanup all terminating pods

kubectl get pod|grep Terminating|awk '{print $1}'|xargs -n 1 echo kubectl delete pod --grace-period=0 --force

Cleanup all non-running pods

kubectl get pods --field-selector=status.phase!=Running -o jsonpath="{range .items[?(@.status.phase != 'Running')]}kubectl delete pod -n {.metadata.namespace}{' '}{}{'\n'}{end}" | sh -

kubectl get pod -A --no-headers |grep -v Running | awk '{print "kubectl delete pod -n "$1" "$2}'|sh -

Tail all logs

This script has helped me so many times quickly finding issues somewhere in k8s containers.


function cleanup
    kill -9 $(jobs -p)
trap "cleanup" 2

function prefix
    while read line; do
        echo "$1$line";
    done < /dev/stdin

function kubectl_log
    typeset namespace="$1"
    typeset pod="$2"
    shift 2
    for i in $(seq 1 $#); do
        typeset container="$1"
        kubectl logs -n $namespace $pod -f $container | prefix "[ $namespace - $pod - $container ] - " &

while read line; do
    kubectl_log $line
done < <(kubectl get pods -A -o jsonpath="{range .items[*]}{.metadata.namespace} {} {}{'\n'}{end}")

List all mounted host paths


function prefix
    while read line; do
        echo "$1$line";
    done < /dev/stdin

echo "----------------------------"
echo checking direct mounts 
echo "----------------------------"
while read ns; do
    if [[ "$ns" == "kube-system" ]]; then

    kubectl get pod -n $ns -o jsonpath="{range ..volumes[?(@.hostPath.path != '')]}{.hostPath.path}{'\n'}{end}" | sort | uniq | prefix "$ns - "

done < <(kubectl get ns -o jsonpath="{range .items[*]}{}{'\n'}{end}")

echo "----------------------------"
echo checking persistent volumes $ns
echo "----------------------------"
kubectl get pv -o yaml -o jsonpath="{range .items[*]}{..hostPath.path}{'\n'}{end}" | sort | uniq


kubeadm token create --print-join-command


kubectl auth can-i --list --namespace=test-restricted


[root@nas kube]# kubectl get no Unable to connect to the server: x509: certificate is valid for,, not

[root@nas kube]# kubectl --insecure-skip-tls-verify get no ...

Leader election

root@node001:~> kubectl describe ep -n kube-system kube-controller-manager
Name:         kube-controller-manager
Namespace:    kube-system
Labels:       <none>
  Type    Reason          Age   From                     Message
  ----    ------          ----  ----                     -------
  Normal  LeaderElection  17m   kube-controller-manager  rb-haha-b_35d43390-6650-4907-99c5-57d1e6455496 became leader

List containers inside docker registry

curl -k https://<IP>:5000/v2/_catalog | jq .

Save and Load containers

docker save myimage:latest | gzip > myimage_latest.tar.gz

docker load < myimage_latest.tar.gz
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May 5 2018

Some random snippets

Potentiometer example / Analog reading/writing / mapping

const int analogInPin = A0; // Analog input pin that the potentiometer is attached to const int analogOutPin = 9; // Analog output pin that the LED is attached to int sensorValue = 0; // value read from the pot int outputValue = 0; // value output to the PWM (analog out) sensorValue = analogRead(analogInPin); outputValue = map(sensorValue, 0, 1023, 0, 255); analogWrite(analogOutPin, outputValue);

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December 28 2017

Some electronics notes


L7805CV - 5V - Voltage regulator

  • Pins from left to right: {input, ground, output}
  • The top part is also ground.
  • Can attach heat sink if needed
  • Quiescent current is not so nice: 6 mA
  • "Not really suitable for usage in batteries, consider instead: Low drop out regulator"
  • Info on the part:

Ultra-Low Quiescent Current LDO Regulator

IRFZ44N Mosfet

Not a "logic-level" mosfet, so I bought the wrong thing,


"If you want to drive this from an Arduino, which only outputs 5V, you will need a "logic-level" MOSFET. For this type of MOSFET, Vgs=5V is enough to turn it on. For example, the ST STP55NF06L would be appropriate and is comparable to the IRFZ44N, except the STP55NF06L is logic-level.

You should also have a resistor in series with the Arduino output to limit the current, since the MOSFET gate is highly capacitive and can draw a big instantaneous current when you try to turn it on (or off). 220 ohms or so is appropriate."

Logic-level alternatives: * FQP30N06L * STP55NF06

  • Pins from left to right: {gate, drain, source}
  • Enabling "gate" will enable electricity to flow from source to drain.

Difference between N or P-channel mosfet:

MOSFETs come in two polarities, P channel and N channel, where "P" stands for positive and "N" stands for negative.

P Channel To turn a P channel MOSFET on, you apply a negative voltage to the gate. This voltage is negative relative to ground. In a circuit, you connect the P channel MOSFET's source terminal to a positive voltage supply and the drain to a resistor connected to ground; the resistor limits the current flowing through the transistor. The circuit diagram symbol for a P channel MOSFET has an arrow pointing away from the gate.

N Channel An N channel MOSFET turns on when you apply a positive voltage at its gate terminal. The voltage is greater than the positive voltage supply at the drain terminal. A resistor between the positive supply and the drain limits current; for an N channel MOSFET, the source terminal connects to ground. The circuit symbol for an N channel MOSFET has an arrow pointing toward the device's gate.

DHT22 - Temperature and Humidity sensor.

  • Pins from left to right: { VCC DATA NC GND } (NC = No connection )
  • Info on the part:

  • ESP8266, wemos d1 arduino studio + DHT22:

  • NOTE!!!! However, be careful hooking it up to 5V and then to an input pin on the ESP8266!!! I think I may have bricked one because of that. It seems to work for a while, but after some time I couldn't program the thing anymore. NOTE: It's unclear if it supports 5V imo: also:

  • Also found you should use a 10k resistor as a pull-up here:

3.3V voltage regulators


PIR 5Pcs/Lot SR501 HC-SR501 Adjust IR Pyroelectric Infrared PIR module Motion Sensor Detector Module for Arduino


upload issues

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September 22 2017

Launch debug shell in some arbitrary piece of code

import code

Or using IPython:

import IPython


name params with ?P<X>,'

In [18]: output = "x:3372 y:1280 screen:0 window:29360137"
In [19]: reg = re.compile(r'x:(?P<X>\d*) y:(?P<Y>\d*)')
In [20]: reg.match(output).group('X')
Out[20]: '3372'

match non-greedy by adding ? suffix

read json from file


import json
from pprint import pprint

with open('data.json') as f:
    data = json.load(f)


Edit for Python3:

with open('data.json', encoding='utf-8') as data_file:
    data = json.loads(

yapf formatter

There is a plugin for pycharm. Installed it, and also pip install yapf.

Then mv /usr/local/bin/yapf /usr/local/bin/yapf.x and created this bash script to tweak some values:

/usr/local/bin/yapf.x --style='{based_on_style: google, column_limit: 100}' "$@" 

file writing

file = open("testfile.txt","w") 
file.write("Hello World") 

temp file name writing

import tempfile
tf = tempfile.NamedTemporaryFile()
temp_file_name =

or better:

import tempfile
with tempfile.NamedTemporaryFile(dir='/tmp', delete=False) as config:
    # temp_file_name =


with exec_helpers:

with exec_helpers.Subprocess() as executor:
    apiserver = executor.check_call('module load kubernetes && kubectl config view -o ' \
    if apiserver:
        return apiserver.stdout_str
raise AbortException("Could not retrieve the Kubernetes API server address")

# ret.exit_code == 0


subprocess.check_output(["echo", "Hello World!"])
subprocess.check_output("exit 1", shell=True)
subprocess.check_output("ls non_existent_file; exit 0", stderr=subprocess.STDOUT, shell=True)

abstract method

For in base class:

import abc

def init(self):

chmod +x

import os
import stat

st = os.stat('somefile')
os.chmod('somefile', st.st_mode | stat.S_IEXEC)


import textwrap
    set -ex
    sleep 10
    echo Failure is the mother of success.


str() -> !s repr -> !r

f"kubectl still returned data for namespace: {json!s}, expected NotFoundException"
f"kubectl still returned data for namespace: {json!r}, expected NotFoundException"


pip install pyyaml

1 import yaml 2 3 with open("/etc/kubernetes/kubelet.kubeconfig") as f: 4 p = yaml.load(f) 5 print(p['clusters'][0]['name'])


from datetime import datetime

datetime.strftime(, "%Y-%m-%d %H:%M:%S") 
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August 14 2017

Place to keep commands I tend to google more than once for some reason.


Start cmd.exe as Administrator

powercfg.exe /hibernate off|on

Some file in C:\ hiberfil.sys (IIRC) will consume quite a bit of disk space which may be a reason for not using the hibernate feature.

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December 19 2016

Assuming it's already flashed etc., (I forgot the steps because it's too long ago!)

What I do is connect the Edison via both micro USB's, one will be used as power, the other can be used for connecting to it.

In case the edison is booted you can open the terminal with screen:

sudo screen /dev/ttyUSB0 115200 115200

Configure the WiFi via configure_edison --wifi

One caveat if you are also on the same network (i.e., your laptop is also on the same network) you may get a conflict via the USB wire. You can see with ifconfig two IP addresses one for the wlan0 and one for usb0, which is probably causing a conflict somehow. Solution is:

ifconfig usb0 down
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August 26 2016

Some stuff I keep here as a cheetsheat for myself

mass replace recursively

NOTE: do not run in case you have .git directory, it can corrupt it.


mv .git /tmp/git_tmp
find . -type f -print0 | xargs -0 sed -i 's/subdomainA\.example\.com/'
mv /tmp/git_tmp .git 

return value

$? return last exit code

buffer control with stdbuf

time make -j24 "$@"  2>&1 | stdbuf -i0 -o0 -e0 tee ./mm.log

sets buffer to zero, everything is piped immediately, bad for throughput, good for latency

< <(command)

gdb on program that works on stream, with mkfifo to make this a combined example (you can issue the bash command instead of the tail -f in this case)

mkfifo /tmp/foo
bash > /tmp/foo
gdb <application>
run <program args> < <(tail -f /tmp/foo)

This syntax is also useful for stuff like:

while read -d ':' line; do
    echo "$line"
done < <(hbase classpath)

A pipe | creates a new subshell, this is also a nice way to avoid this (subshells cannot modify variables of their parent)!

EDIT: This is called process substitution, see

echoing multiple lines to a file

cat <<EOT >> greetings.txt
line 1
line 2


if [[ $foo =~ foo ]]; then

Note that you DO NOT use asterisks like *foo*!

processing stdin

A pattern I use quite a bit is the following.

function func
    while read line; do
        echo $line
    done < /dev/stdin
cat foo.txt | func

subshells / pids

Sometimes subshells are useful.

echo mypid = $!

( sleep 10; ) &
typeset pid=$!
sleep 1
kill $pid # kill if still running..

Note that you can use exit in a subshell without destroying the parent.

trap CTRL+C

function myfunc
    echo Do some cleanup here..
    exit 0
trap "myfunc" 2
print "Press CTRL+C to abort 10 seconds of waiting.."
sleep 10


First learned about this in kornshell, but seems to work for bash as well.

function func {
    local -n test_ref=$1
    test_ref="Hello world"

func test # note omitted $-sign

echo $test

If you want kornshell compatibility use typeset -n instead of local -n.

The same example, but with an array, you have to first explicitly declare the array before passing it to func.

declare -A array
function func {
    local -n array_ref=$1
    array_ref=([one]=aaa [two]=bbb [three]=ccc)
func array

(If you want kornshell compatibility again, use typeset -A instead of declare -A (and typeset -n for local -n)).


Continuing the previous paragraph, some useful examples regarding arrays.

echo ${array[@]}  # aaa bbb ccc
echo ${!array[@]} # one two three
echo ${#array[*]} # 3

for key in ${!array[@]}; do
    local value=${array[$key]}
    echo $key = $value # one = aaa, ... 

Instead of initializing with the array=([foo]=bar [baz]=ban) syntax, assignment syntax is array[foo]=bar.

bash substrings

typeset hostname=$(hostname -s)
hostname=${hostname:0:10}  # first 10 chars..

NFS caching

Trick to use cachefilesd on NFS mounts. Useful if you work remote on a mounted NFS share. btrfs is not supported, so I create an ext4 mount instead like this:

dd if=/dev/zero of=/tmp/fscache.txt bs=1M count=4000
# be careful with choosing /dev/loopN
losetup /dev/loop10 /tmp/fscache.txt
mkfs.ext4 /dev/loop10
mount /dev/loop10 /var/cache/fscache

Very useful other commands can be found here: (i.e.: cat /proc/fs/nfsfs/*)

Benchmark I/O

start iperf -s server, then iperf -c

Show Network I/O per process

atop can do this, which comes provided by your package manager probably, but chances are you need to compile it yourself for a newer version. The new version makes it possible to compile a kernel module, which (after reboot) will make network counters available in atop. Quite awesome!

simulate slow network

export interface=enx9cebe8349fdc
sudo tc qdisc add dev $interface root netem delay 10000ms
sudo tc qdisc del dev $interface root netem 


Prints files count per directory for current directory level:

du -a | cut -d/ -f2 | sort | uniq -c | sort -nr

UDP traffic through SSH tunnel

Using iptables to redirect ip address

iptables -t nat -A OUTPUT -d -j DNAT --to-destination

sslh i.e.,

WHAT IS IT? sslh accepts connections on specified ports, and forwards them further based on tests performed on the first data packet sent by the remote client.


trigen@zenbook:~> echo "Hello world (y)" | sed 's/(y)/:-)/'
Hello world :-)
trigen@zenbook:~> echo "Hello world (y)" | sed 's/.*\((y)\)/smiley: \1/'
smiley: (y)

trigen@zenbook:~> sed -i.bak 's/H/J/g' test.txt
trigen@zenbook:~> cat test.txt
Jello world
trigen@zenbook:~> cat test.txt.bak
Hello world

Another nice example

sed -i '/upload_max_filesize/s/=.*/= 100M/' /etc/php/7.2/apache2/php.ini

(-n don't echo all (double check if this is true), /p to print, \1 to print between ()'s (escaped))

fdisk -l |& sed -n 's/^Disk \/\([^:]*\).*$/\/\1/p'
fdisk -l |& sed -n 's/^Disk \/\([^:]*\).*$/\/\1/p' | xargs -n 1 -I{} /bin/sh -c "echo {}; smartctl -H {}"

Nice resource for sed stuff:

check if port is open

nc -z -v -w1 80

openssl check certificates

openssl x509 -in <INPUT> -text

openssl s_client -showcerts -connect </dev/null
# in case of SNI (combined domains in certificate)
openssl s_client -showcerts -servername -connect </dev/null

# grep for alt subjects
openssl s_client -connect -servername < /dev/null 2>/dev/null | openssl x509 -noout -text | grep -A1 'Subject Alternative Name'

# or..
openssl s_client -showcerts -connect </dev/null | openssl x509 -noout -ext subjectAltName

set boot target graphical or not


systemctl enable multi-user
systemctl set-default multi-user
systemctl enable graphical
systemctl set-default graphical


systemctl list-units --type target --state active

commandline json prettify

echo '{"foo": "lorem", "bar": "ipsum"}' | python -m json.tool

sed extract piece of text

openstack server list | grep ...  | sed -n 's/.*\(10\.2[^;]*\);.*/\1/p'

kpartx dd img

kpartx -rav some.dd

readonly add partition devmappings verbose

mount /dev/mapper/loop0p5 /mnt/loop0p5/

umount /mnt/loop0p5

kpartx -d some.dd or kpartx -d /dev/loop0

see losetup -a for available loops

note losetup -D doesn't work for some reason when the partitions were created with kpartx



"after you reattach a ctrl-a F runs the "fit" command to resize the current window. if you reattach using the -A option it should resize all windows when you reattach. "


Assuming the hash of the commit you want is c5f567 (source):

git checkout c5f567 -- file1/to/restore file2/to/restore

The git checkout man page gives more information. If you want to revert to the commit before c5f567, append ~1 (works with any number):

git checkout c5f567~1 -- file1/to/restore file2/to/restore

git find when file was deleted

Taken from source:

git log --full-history -- [file path]

git log --full-history -1 -- [file path]

turn .a (thin) archive into "normal" one. (Source)

After some additional research, ar -t can be used to enumerate the object files in an archive, so after that it's just a matter of providing that list to ar as you usually would when creating an archive.

The following script handled this for all of the libraries at once:

for lib in `find -name '*.a'`;
    do ar -t $lib | xargs ar rvs $ && mv -v $ $lib;

clipboard fu

There is a difference in clipboards I've noticed, which confuses me bigtime.

Apparently one is the "X clipboard":

echo Hello world | xclip

Whenever pasting doesn't work try the middle mouse button.. Or use xsel instead:

echo Hello world | xsel --clipboard
echo Hello world | xsel -b # same

Some params for xsel:

Selection options
    -p, --primary         Operate on the PRIMARY selection (default)
    -s, --secondary       Operate on the SECONDARY selection
    -b, --clipboard       Operate on the CLIPBOARD selection

resize images in directory to smaller size (recursively)

find . -name '*.jpg' -execdir mogrify -resize 1024x {} \;

installing trusted certificates in system

  • chromium has some way to also import authorities you might also try it
  • get certs with openssl s_client -showcerts -connect
  • I put the certs for example 3 different .crt files in /usr/local/share/ca-certificates/
  • do not use .pem or they won't be recognized.
  • you have to be root to put them there.
  • sudo update-ca-certificates should pick them up

git change author for bunch of commits

git rebase -i HEAD~2
mark commits as edit, then use this over and over:

git commit --amend --author="Ray Burgemeestre <>"
git rebase --continue


socat TCP-LISTEN:8081,fork TCP:

git stuff


find files less then a day old

find ./ -name '*.meta' -type f -mtime -1;

# then delete
find ./ -name '*.meta' -type f -mtime -1 -exec rm -f {} \;

find files for specific day

find ./var -printf "%p %TY-%Tm-%Td %TH:%TM:%TS %Tz\n" | grep 2022-01-01


get rid of rpm without dependencies example


# rpm -qa | grep "php-sqlite2"
# rpm -e --nodeps "php-sqlite2-5.1.6-200705230937"

determine octal representation of permissions

Sometimes it's annoying, to reverse engineering rwx -> 7, r-x -> 5 and r-x -> 5. For example, I misread the group part for -xr the first time.

shell# ls -althrst /var/lib|grep etcd
0 drwxr-xr-x  2 etcd          etcd             6 Nov  5 14:19 etcd

Thanks to google and stackoverflow (

shell# stat -c "%a %n"  /var/lib/etcd/
755 /var/lib/etcd/

Much easier!

print dates for bunch of dirs

cat /tmp/dirs | xargs -n 1 stat -c '%y %n'

%x     Time of last access
%y     Time of last modification
%z     Time of last change


sometimes you have some disconnected session that still forces some pane to be non-full size. you can force a full resize again using: ctrl+b, :detach-client -a.


Running an X application in docker I usually google for the right parameters, but sometimes they forget the X authority file. Now I use this:

xhost +
docker run --name=foobar --privileged -it -v $PWD/../:/articlemanager --workdir /articlemanager \
       -e DISPLAY \
       -v /tmp/.X11-unix:/tmp/.X11-unix \
       -v $HOME/.Xauthority:/root/.Xauthority \
       --net=host \
    foobar:latest xeyes

If you want to do it in a more correct/secure way, I found this blog post:

Also found some useful info here: (In my above example the net=host was needed too, but it's annoying port 80 is already in use for example.)

bash if statements and defaults

There are some interesting snippets here that I need to extract:

add user to group

usermod -a -G docker ray

if you are added to a group, you can do newgrp docker or login again.

Assigning extra IP address to interface

sudo ip addr add dev enp0s3
ip addr

avahi / mDNS<

Available on most Linux distro's, Raspberry PI's and Arduino devices.

It's a convenient way to allow devices to find each other on a network Now I let the raspberry pi's here publish some service named "_ray" so I can easily find them:

trigen@zenbook:~&gt; avahi-browse -d local _ray._tcp --resolve -t
+ wlp3s0 IPv6 dashboardpi                                   _ray._tcp            local
+ wlp3s0 IPv4 domoticapi                                    _ray._tcp            local
+ wlp3s0 IPv4 dashboardpi                                   _ray._tcp            local
= wlp3s0 IPv6 dashboardpi                                   _ray._tcp            local
   hostname = [dashboardpi.local]
   address = [fe80::90c3:716c:7d24:ccc9]
   port = [80]
   txt = []
= wlp3s0 IPv4 domoticapi                                    _ray._tcp            local
   hostname = [domoticapi.local]
   address = []
   port = [8083]
   txt = []
= wlp3s0 IPv4 dashboardpi                                   _ray._tcp            local
   hostname = [dashboardpi.local]
   address = []
   port = [80]
   txt = []


pi@domoticapi:~ $ cat /etc/avahi/services/ray.service 
<?xml version="1.0" standalone='no'?><!--*-nxml-*-->
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
  <name replace-wildcards="yes">%h</name>

and restart the avahi-daemon

NAS disk failure


for x in /sys/block/sd*
    dev=$(basename $x)
    host=$(ls -l $x | egrep -o "host[0-9]+")
    target=$(ls -l $x | egrep -o "target[0-9:]*")
    a=$(cat /sys/class/scsi_host/$host/unique_id)
    a2=$(echo $target | egrep -o "[0-9]:[0-9]$" | sed 's/://')
    serial=$(hdparm -I /dev/$dev | grep "Serial Number" | sed 's/^[ \t]*//')
    echo -e "$dev \t ata$a.$a2 \t $serial"

in my case ata5 was throwing errors in dmesg -w,


sda      ata1.00     Serial Number:      S12RNEAD500626J
sdb      ata2.00     Serial Number:      W4Z1GZLP
sdc      ata3.00     Serial Number:      R6GGJN0Y
sdd      ata4.00     Serial Number:      WD-WMC4M0F6RXR8
^Csde    ata5.00
sdf      ata6.00     Serial Number:      ZA19BLKY
sdg      ata7.00     Serial Number:      ZA19Z3D9
sdh      ata8.00     Serial Number:      45D0LWNAS

caveat: this command blocks if the hdd is broken, so in that case you want to make an async version of this command. but in my case I was lucky enough that control+c already told me sde was the bad apple.

vim insert non breaking space


In Vim, you can insert it with Ctrl-v x a 0

git stuff

git diff HASH^! diff against it's parent, sometimes reversed for me I then simply use

git diff HASH~1 HASH

git reset --soft HEAD~1 # also creates the reference ORIG_HEAD git commit --reuse-message=ORIG_HEAD # can be used to re-use the message

ldd tree

package pax-utils

lddtree $BINARY

test mic input real time in linux


I'm using pavucontrol

pactl load-module module-loopback latency_msec=1

To unload loopback

pactl unload-module module-loopback

netgear r7000

nvram set wl_regdomain="EUROPE" nvram set wl_country_code="EU" nvram commit

to enable channel 13 and 14

image to pdf

img2pdf -o sample.pdf sample.jp2

print queue view

lpstat -R

# writing to fd 3, ./ 3>&1

or beforehand:

exec 3>&2

lsof open deleted files

lsof +L1

diff rsync

Using rsync to merge two dirs with changes in both dirs. Check if rsync won't overwrite anything:

# dry run of rsync, note no --delete
rsync --dry-run -raPv owncloud_deskmini/ owncloud/ |& tee out.log
# dry run of rsync with "u" flag that ignores updates
rsync --dry-run -rauPv owncloud_deskmini/ owncloud/ |& tee out2.log
diff out.log out2.log 

If files show up in the diff those might be overwritten


coredumpctl -1 debug



# keep foo only if it contains a valid integer, otherwise truncate
[[ $foo =~ ^-?[0-9]+$ ]] || foo=""


cat << EOF > file.yaml

The above has a flaw, it will replace for example $1 stuff, but if you put the EOF in single quotes, it will preserve it:

cat << 'EOF' >
Contents $1

This is also possible:

if [[ -z $1 ]]; then
    cat <<- EOF > file.yaml
    EOF   # as long as EOF is indented with TAB character(s)


trigen@xps:~/projects/jirahours[master]> date +"%Y-%m-%d %T +0200 CEST"
2021-06-01 14:04:56 +0200 CEST
root@rb-b91-s15sp2-03-21-a:~# date +"%Y%m%d%H%M%S"

sudo dpkg-reconfigure tzdata to fix the timezone.



gdb -p $(pidof myprogram) < <(printf "yes\nset pagination off\nset logging on\nbt\nthread apply all bt\ninfo threads\nquit\n")

prevent X from turning off screen/sleeping

xset dpms 0 0 0 && xset s noblank  && xset s off


mysqldump --skip-extended-insert --default-character-set=utf8mb4 -u root -pPASSWORD wordpress -r ./wordpress.sql
mysql --default-character-set=utf8mb4 --protocol=TCP --host -uroot -pPASSWORD --database=wordpress  < wordpress.sql


comma-separate multiple lines

$ awk -v ORS=, '{print $2}' data.txt | sed 's/,$//'
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C++ streams


 std::ifstream fi;"all.csv");
 std::string line;
 while (getline(fi, line, '\n')) {
     std::cout << "line = " << line << std::endl;


#include <fstream>
std::ofstream log_file(
    "log_file.txt", std::ios_base::out | std::ios_base::app );
log_file << text << std::endl;


Initialize N elements at once with: vector<int> vec_out(vec_in.size(), 0);.

Put last elem in front data[0] = data[data.size() - 1]; and erase last data.erase(data.begin() + (data.size() - 1), data.end());


Sum accumulate(count.begin(), count.end(), 0).

Rotate 1 2 3 -> 2 3 1 with rotate(A.begin(), A.begin() + K, A.end());, the other way around with rbegin() and rend() respectively.

Find std::find(std::begin(c), std::end(c), 1001) != std::end(c);

Erase + remove idiom: c.erase(std::remove(std::begin(c), std::end(c), 1001), std::end(c));


std::vector<Foo> foos;
for (int i = 0; i<10; i++) {

std::vector<int> xs;
std::transform(foos.begin(), foos.end(), xs.begin(), [](Foo f){return f.x;});


with ranges:

#include <iostream>
#include <range/v3/view.hpp>

struct Object {
    int x;
    float y;

int main() {
    std::vector<Object> objs = {{1, 4.2f}, {42, 5.1f}, {69, 6.9f}};
    std::vector<int> xs = objs | ranges::view::transform(&Object::x);
    for (auto x : xs) {
        std::cout << " " << x;
    std::cout << std::endl;

    for (auto y : objs | ranges::view::transform(&Object::y)) { // No new vector created.
        std::cout << " " << y;
    std::cout << std::endl;

join string boost so

#include <boost/algorithm/string/join.hpp>
#include <vector>
#include <iostream>

int main(int, char **)
    std::vector<std::string> list;

    std::string joined = boost::algorithm::join(list, ", ");
    std::cout << joined << std::endl;

join string non-boost

std::string s = std::accumulate(std::next(v.begin()), v.end(),
                                std::to_string(v[0]), // start with first element
                                [](std::string a, int b) {
                                    return a + '-' + std::to_string(b);



template <typename... Params>
void remove(Params &&... node) {
  static_assert(std::is_constructible<Type, Params...>::value, "parameters are invalid for constructing a Type");
  auto n = std::make_unique<value_type >(std::forward<Params>(node)...);
  remove(static_cast<const value_type &>(*n.get()));


#include <sstream>
stringstream ss;
ss << "hello world" << 123 << endl;
ss.str(); // ...
ss.str("");  // re-use.

binary search

std::sort (v.begin(), v.end());                       // 10 10 10 20 20 20 30 30
auto low = std::lower_bound (v.begin(), v.end(), 20); //          ^        ^
auto up  = std::upper_bound (v.begin(), v.end(), 20); //                   ^


// "if the number is less.. goes down the pile"
priority_queue<int, vector<int>, std::less<int>> pq; 
for (int i : {1, 6, 3}) 
    pq.emplace(i);; // 6
pq.pop();; // 3

Exposes it's container as protected member variable. In order to access, you have to extend priority_queue. Underlying data structure is a heap.


bitset<8> bs; 
bs.set(2); // 00000101


Underlying container type is a binary tree. So most stuff is log n. Note that a binary tree is also sorted, so the first element *the_set.cbegin() is the min() element!


unique_ptr<foo> p{nullptr};
p = make_unique<foo>();

Perfect forwarding variable template args

namespace std {
  template<typename T, typename ...Args>
  std::unique_ptr<T> make_unique(Args &&...args) {
    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));




#include <iterator>
copy(tokens.begin(), tokens.end(), ostream_iterator<string>(cout, "\n"));

readable input parameters

void split(string in, vector<string> *tokens_ptr, string delim = " ") {
    vector<string> &tokens = *tokens_ptr;

split(input, &tokens, " ");


// find
string s("aa b c");
s.find(" "); // finds 2
s.find(" ", 3); // finds 4 (starting search from the "b")
// substr()
s.substr(0, 2); // start + length!
s.substr(pos, pos - previous); // typical

tokenizer with getline()

really nice implementation using getline() from this stackoverflow answer.

#include <string>
#include <sstream>
#include <vector>

using namespace std;

void split(const string &s, char delim, vector<string> &elems) {
    stringstream ss(s);
    string item;
    while (getline(ss, item, delim)) {

vector<string> split(const string &s, char delim) {
    vector<string> elems;
    split(s, delim, elems);
    return elems;

iterate to stdout with ostream_iterator<T> and copy()

#include <iterator>
#include <algorithm>

// output even a newline after each element
copy(c.begin(), c.end(), ostream_iterator<string>(cout, "\n"));

convert binary file into c code

xxd -i favicon.ico > favicon.ico.h

sorting concatinating

template <typename T>
std::string join_keys(std::vector<T> &idsVec) {
    std::stringstream ids;

    // remove dupes
    std::sort(idsVec.begin(), idsVec.end());
    idsVec.erase(std::unique(idsVec.begin(), idsVec.end() ), idsVec.end());

    // join ids with ","
    std::copy(idsVec.begin(), idsVec.end(), std::ostream_iterator<T>(ids, ","));
    std::string ids_str = ids.str();

    // remove the trailing ", "
    ids_str.erase(ids_str.empty() ? 0 : ids_str.length() - 1);
    return ids_str;


c++17 will support it, in g++ version 7.0 it can be enabled with --std=c++1z

#include <optional>

std::optional<std::string> empty;
std::optional<std::string> filled{"hello"};

if (filled) {
    std::cout << "filled = " << *filled << std::endl;
std::cout << "empty = " << empty.value_or("nothing") << std::endl;

c++14 flag --std=c++1y in g++ 4.9 supports std::experimental::optional

#include <experimental/optional>

std::experimental::optional<int> empty;

Note there is also make_optional.

file reading

using namespace std;
ifstream ifile("webroot/"s + folder + "/" + file, ios::binary);
string s( (istreambuf_iterator<char>(ifile)),
          (istreambuf_iterator<char>()) );
cout << "read = " << s.size() << " & " << s.length() << endl;

multiline string literal

const char * long_test = R"( ... )";
const char * long_test = R"XXX( ... )XXX";

std::experimental::optional and std::reference_wrapper

Passing optional reference:

#include <iostream>
#include <experimental/optional>
#include <functional>

namespace std {
  using std::experimental::optional;

void foo(std::optional<std::reference_wrapper<bool>> flag = {}) {
    if (flag) {
        flag->get() = true;

int main() {
    bool flag = false;
    std::cout << "flag is now: " << std::boolalpha << flag << std::endl;

chrono stuff

/* sleeping */

/* timing */
auto last_received = std::chrono::high_resolution_clock::now();
auto current_time = std::chrono::high_resolution_clock::now();
std::chrono::duration<double, std::milli> idle = current_time - last_received;
if (idle.count() > 500.) {

    /* literals */
    using namespace std::literals;




#include <algorithm> // copy
#include <iterator> // back_inserter
std::copy(from_vector.begin(), from_vector.end(), std::back_inserter(to_vector));

boost reverse iter

void OpenStackStrategy::apply(CustomizationFileEntryPairList &customizations)
  size_t index = customizations.size();
  for (const auto &customization : boost::adaptors::reverse(customizations)) {
    const auto &file = customization.first;
    const auto &entry  = customization.second;

cout fu

std::cout << std::fixed << some_double_variable << std::endl;
std::cout << std::boolalpha << some_boolean_variable << std::endl;

vector or set difference

std::sort(ignore_domains.begin(), ignore_domains.end());
std::sort(search_domains.begin(), search_domains.end());

std::vector<std::string> result;
        search_domains.begin(), search_domains.end(),
        ignore_domains.begin(), ignore_domains.end(),
        std::back_inserter( result )


epoch time

auto now = std::chrono::system_clock::now();
auto epoch = std::chrono::system_clock::to_time_t( now );
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Ray Burgemeestre
february 23th, 1984

C++, Linux, Webdev

Other interests:
Music, Art, Zen