cmd replacement: cmder

Written by marcelpetrick on March 29, 2019

Sometimes you have to call some batch-files with spoecific windows-tools, so a bash is not helpful on Win.
A colleague recommended cmdr, which is quite nice and fine.
Suits my needs 🙂

advanced whitespace-correction

Written by marcelpetrick on February 26, 2019

(for CMake/C++-projects)

Find all fitting files and run the fixer-script in parallel over it.

 ( find . -name "CMakeLists.txt" ;   find . -name "*.cmake" ;   find . -name "*.h" ;   find . -name "*.cpp" ) | parallel --bar ../removeTrailing.sh

1	( find . -name "CMakeLists.txt" ; find . -name ".cmake" ; find . -name ".h" ; find . -name "*.cpp" ) \| parallel --bar ../removeTrailing.sh

After playing for a while with sed and awk and not being able to get a fitting solution, I decided to create my own as python-script. It squashes all consecutive double-whitespace-lines (and adds one to the end if missing).

Sources:
removeTrainling.sh
squashMultipleWhitespace.py
get GNU parallel (developed by Ole Tange):

(wget -O - pi.dk/3 || curl pi.dk/3/ || fetch -o - http://pi.dk/3) | bash

1	(wget -O - pi.dk/3 \|\| curl pi.dk/3/ \|\| fetch -o - http://pi.dk/3) \| bash

Pick a random reviewer

Written by marcelpetrick on January 30, 2019

Most teams have a certain code-review-process. But most of the time there is no “round robin”-implementation who will be the reviewer, but the coder itself should select the reviewer. Because of domain-knowledge, etc. And then you her lots of times “I am currently busy. Not me!”

Solution: random and fair selection via bash.

#!/bin/bash
# initialize the array
array=(MSA MBH HGA GSC MPE NLE RNI MLA)

size=${#array[@]}
index=$(($RANDOM % $size))
echo "Mister ${array[$index]} is your candidate as reviewer. Congratulations!"
echo "In case you picked yourself - just rerun ;))"

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#!/bin/bash

# initialize the array

array=(MSA MBH HGA GSC MPE NLE RNI MLA)

size=${#array[@]}

index=$(($RANDOM % $size))

echo "Mister ${array[$index]} is your candidate as reviewer. Congratulations!"

echo "In case you picked yourself - just rerun ;))"

Current version of the script can be found at: https://github.com/marcelpetrick/bashCollection/blob/master/randomReviewer.sh

Inspired by a stack-overflow answer.

find the fattest files of certain type

Written by marcelpetrick on January 30, 2019

$ find . -name "*.LSimg" -exec ls -al {} \; | sort -nr -k5 >> listOfFattestFiles.txt

1	$ find . -name "*.LSimg" -exec ls -al {} \; \| sort -nr -k5 >> listOfFattestFiles.txt

creates something like

-rw-r--r-- 1 mpe 1049089 323707001 Mai 29  2018 ./a.LSimg
-rw-r--r-- 1 mpe 1049089 21342433 Mai 29  2018 ./b/c.LSimg
-rw-r--r-- 1 mpe 1049089 21342432 Mai 29  2018 ./e.LSimg
..

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-rw-r--r-- 1 mpe 1049089 323707001 Mai 29 2018 ./a.LSimg

-rw-r--r-- 1 mpe 1049089 21342433 Mai 29 2018 ./b/c.LSimg

-rw-r--r-- 1 mpe 1049089 21342432 Mai 29 2018 ./e.LSimg

..

Fix whitespace

Written by marcelpetrick on January 24, 2019

Sometimes there is too much whitespace and tabs in my last commit.
In former times I used a VisualStudio-plugin, but this is not helpful there. So I wrote a small script (see on my github) which:
• replaces all tabs with four spaces
• removes all trailing whitespace
• converts line-endings to CRLF

I invoke it on the list of all changes files in my last commit in the git-repo with:

$ git diff --name-only HEAD~1 HEAD | xargs -L1 ../removeTrailing.sh

1	$ git diff --name-only HEAD~1 HEAD \| xargs -L1 ../removeTrailing.sh

(first part gives you a list of changed files and then feeds it to the script for execution)

Overview of author-activities for the git-repo

Written by marcelpetrick on January 16, 2019

If some ‘sophisiticated’ tool like git-stats is too cumbersome to configure, just do some git-log and shell-magic:

$ git log --format='%aN' | sort | uniq -c | sort
      4 Hans Wurst
      6 Klaus Blume
      6 Bernd Meier
     26 Marcel Petrick
     32 Ali Baba
     37 Linus Torvalds

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$ git log --format='%aN' | sort | uniq -c | sort

4 Hans Wurst

6 Klaus Blume

6 Bernd Meier

26 Marcel Petrick

32 Ali Baba

37 Linus Torvalds

Ok, just noticed that git has something built-in:

$ git shortlog -sn

1	$ git shortlog -sn

from: https://coderwall.com/p/pek-yg/git-statistics-for-repo-per-author – Thanks Marcin Olichwirowicz!

keep the catcam up to date

Written by marcelpetrick on July 10, 2018

Logging in to the raspberry(ies) to update them on a regular basis takes time and effort. Both are currently dear.
Also: while the catcam is taking pictures, you can’t update the rpi-binaries.

So I made this nice script, which first suspends the catcam-operation while renaming the script from the cronjob, then does all updates, reverts the renaming and then reboots the MCU.

#!/usr/bin/env bash

# author:	Marcel Petrick (mail@marcelpetrick.it)

mv /home/pi/Desktop/webcam/regulargif.sh /home/pi/Desktop/webcam/regulargif.sh1 
sudo rpi-update 
sudo apt-fast update && sudo apt-fast dist-upgrade -y
sudo apt-get autoclean
sudo apt-get autoremove
mv /home/pi/Desktop/webcam/regulargif.sh1 /home/pi/Desktop/webcam/regulargif.sh
sudo reboot

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#!/usr/bin/env bash

# author: Marcel Petrick (mail@marcelpetrick.it)

mv /home/pi/Desktop/webcam/regulargif.sh /home/pi/Desktop/webcam/regulargif.sh1

sudo rpi-update

sudo apt-fast update && sudo apt-fast dist-upgrade -y

sudo apt-get autoclean

sudo apt-get autoremove

mv /home/pi/Desktop/webcam/regulargif.sh1 /home/pi/Desktop/webcam/regulargif.sh

sudo reboot

Make it executeable via ‘sudo chmod +X updateCatcam.sh’ and also add it as cronjob (once a day).

rsync: get all files from the camera’s sd-card .. without interruption

Written by marcelpetrick on July 6, 2018

rsync -avzr --progress /media/tanteedith/4C26-6BEF/DCIM/ /home/tanteedith/digikamArchive/

1	rsync -avzr --progress /media/tanteedith/4C26-6BEF/DCIM/ /home/tanteedith/digikamArchive/

Of course, you need the same source- and target-directory 😉
Using this, because Nautilus (or how that horrible explorer is called) is prone to auto-unmounting the card while transfer due to heavy load ..

Catcam upgraded!

Written by marcelpetrick on March 13, 2018

Terminator is watching you!

Finally! The old catcam-setup of a RPi 3 with a NoIR v2.1-camera was working for almost one and ahalf years without any issues. I’ve had improved the PiCamGifForTumblr-script several times, also changed location – never any issues. More than 40.000 GIF were uploaded.
But then I decided to buy a new, fancy case in black (of course) which should add some camera-support. And then two weeks afterwards it stopped working. Sporadically frozen. Sometimes 10 min after start, sometimes during the night. I checked the casing, if all power connectors were tightly fit, I installed netdata on it, I did longterm temperature-measurements (never over 54 °C even with closed case), I ran with minimal setup or with cam attached.
Then it became clearer: the camera was working for singleshot-mode, but for the 30 pictures every ten minutes, it broke. So, it was time to order a new camera, 1080p (5 MPixel) were enough, but for four more Euro I could get two IR-illuminators … so, why not? The focal distance of the objective is adjustable, it looks like it works (long time-test needed). But I am happy. And we can watch cats (and family) in darkness :3

tracking bugs in complex systems ..

Written by marcelpetrick on March 6, 2018

Some weeks ago I’ve replaced the case of the ‘catcam’. A Raspberry Pi 3 which was running for 1.5 years without interruption with the nice script & python-upload triggered by a cronjob. And now the device freezes. Still running, but neither accessible via SSH nor VNC (of course, if SSH is not working ..).
I left the case open; removed the camera; upgraded kernel and Raspbian: nothing helped.
My last guess is that the camera stopped working. But to be sure I want to let the RPi3 long-time with temperature-logging. So … we need a simple program:

import os
import time

def measure_temp():
        temp = os.popen("vcgencmd measure_temp").readline()
        return (temp.replace("temp=",""))

while True:
        print(time.ctime() + " ## " + measure_temp())
	time.sleep(1)

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import os

import time

def measure_temp():

temp = os.popen("vcgencmd measure_temp").readline()

return (temp.replace("temp=",""))

while True:

print(time.ctime() + " ## " + measure_temp())

time.sleep(1)

executed like this, because else the output is buffered up to 4 or 8 kByte:

$ stdbuf -oL python temperature.py > worstLoggingEver.txt

1	$ stdbuf -oL python temperature.py > worstLoggingEver.txt

and the content of the textfile is something like:

Tue Mar  6 22:52:59 2018 ## 51.5'C
Tue Mar  6 22:53:00 2018 ## 52.1'C

1 2	Tue Mar 6 22:52:59 2018 ## 51.5'C Tue Mar 6 22:53:00 2018 ## 52.1'C

solutions; not code

Bash