k8s

Get available contexts

$ kubectl config get-contexts
CURRENT   NAME                 CLUSTER                      AUTHINFO                                NAMESPACE
          docker-for-desktop   docker-for-desktop-cluster   docker-for-desktop                      
*         matchboxaks          matchboxaks                  clusterUser_rolexorg-rg_matchboxaks     
          minikube             minikube                     minikube                                
          portfolioaks         portfolioaks                 clusterUser_portfolio-rg_portfolioaks   
          rolexorgaks          rolexorgaks                  clusterUser_rolexorg-rg_rolexorgaks     

Set context

$ kubectl config use-context docker-for-desktop

See how it is going

$ kubectl cluster-info

SSH

List active ssh-agent keys

$ ssh-add -l
2048 SHA256:5g46yzdbvsjFlfrzirtysaifXjV1ovjqk5g0cJoSDAM /Users/abernier/.ssh/id_rsa (RSA)

Add a key to ssh-agent

$ ssh-add ~/.ssh/bitbucket_rsa

NB: we add here the private key bitbucket_rsa (not the public one)

Remove a key from ssh-agent

$ ssh-add -d ~/.ssh/bitbucket_rsa

Test a connection

see: https://help.github.com/en/articles/using-ssh-over-the-https-port

$ ssh -T git@bitbucket.org
logged in as abernier_

or on another port:

$ ssh -T -p 7999 git@bitbucket.rlx-prod.com

Docker

nyancat from Ubuntu v18.04

docker build -t foo - <<EOF && docker run -it foo --rm
FROM ubuntu:18.04

RUN apt-get update && apt-get install -y nyancat

ENTRYPOINT ["nyancat"]
EOF

list processus running on a port

lsof -i :4444

vpnkit  52904 abernier   24u  IPv4 0x815ff215ffa91625      0t0  TCP *:krb524 (LISTEN)
vpnkit  52904 abernier   25u  IPv6 0x815ff2160369a455      0t0  TCP localhost:krb524 (LISTEN)

and kill them:

kill -9 $(lsof -ti :4444)

patching

$ diff file_v1 file_v2 >file_v2.patch

them applying it:

patch file <file_v2.patch

git

diff between 2 commits

git diff -w <commitA>..<commitB> path/to/*.html

• NB1: git log to grab <commitN>
• NB2: -w for ignoring whitespaces changes

Patch

See: https://stackoverflow.com/questions/3418277/how-to-apply-git-diff-patch-without-git-installed

Generate:

git diff > patchfile

Apply (without git):

patch -p1 <patchfile

chmod

find . -type d -exec chmod 0755 {} \;
find . -type f -exec chmod 0644 {} \;

rsync 2 folders

rsync -av --delete --exclude .git --exclude .DS_Store folderA/ folderB/

or syncing local <=> remote

rsync -av --delete --exclude .git --exclude .DS_Store ~/Sites/quick-front/dist/ dev@5emeg.com:/home/projects/www/quick-front/web/

.bash_profile

# Path
PATH=${HOME}/bin:${PATH}

# Editor
export EDITOR='subl -w'

git tag

<increment package.json.version>
git add package.json
git commit -m "bump version"
git tag v0.1.4
git push --tags

npm private dependency

...
"dependencies": {
  "myprivaterepo": "git+ssh://git@github.com/abernier/myprivaterepo.git#v0.1.4"
}

convert a multi-pages PDF to images

first install imagemagick:

brew install imagemagick
brew install ghostscript
brew link --overwrite ghostscript
brew reinstall imagemagick --build-from-source

then:

convert -alpha off -density 300 -depth 8 pages.pdf -resize 25% -background white -quality 95 pages_%02d.jpg
montage -mode concatenate -tile 2x pages_*.jpg pages.jpg

merge sereval PDFs together

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=filemerged.pdf file1.pdf file2.pdf

install rbenv

brew install rbenv ruby-build

Then add eval "$(rbenv init -)" line to your ~/.bash_profile

Then :

source ~/.bash_profile

rbenv install -l
rbenv install 2.1.1
rbenv global 2.1.1
rbenv version
2.1.1 (set by /Users/antoinebernier/.rbenv/version)

create a file

cat <<EOF > hi.txt
hi,
there!
EOF

Test gzip compression (outputs bytes)

gzip -c filename.min.js | wc -c

Exec amélioré (le nom du fichier est transmis à xargs et dispo sous $0 dans la commande sh)

find . -name "*.txt" -print0 | xargs -0 -I '{}' sh -c 'echo $0' '{}'

ffmpeg

INSTALL

On mac:

brew install ffmpeg --devel --with-libvpx b--with-fdk-aac

or with static version (see: https://gist.github.com/abernier/bbe6e3f8fa2b96b593731d55956a09a8):

curl -o- https://cdn.rawgit.com/abernier/bbe6e3f8fa2b96b593731d55956a09a8/raw/89b3c4648f93f99a382f7a674af07bdabd0017cc/ffmpeg-4.0-install.sh | sh

HTML5 video encoding

see: https://gist.github.com/Vestride/278e13915894821e1d6f

<video>
  <source src="myvid.webm" type="video/webm; codecs=vp9,vorbis">
  <source src="myvid.mp4" type="video/mp4">
</video>

ffmpeg -i myvid.mov -vcodec h264 -acodec aac -pix_fmt yuv420p -profile:v baseline -level 3 myvid.mp4
ffmpeg -i myvid.mov -vcodec libvpx-vp9 -b:v 1M -acodec libvorbis myvid.webm

rotate

ffmpeg -i in.mov -vf "transpose=1" out.mov

with:

0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip

see: http://stackoverflow.com/a/9570992/133327

lossless crop

ffmpeg -i in.mov -filter:v "crop=out_w:out_h:x:y" -c:v libx264 -crf 0 -c:a copy out.mp4

with:

• out_w -- width of the output rectangle
• out_h -- height of the output rectangle
• x, y -- top left corner of the output rectangle

see: http://video.stackexchange.com/a/4571 and https://stackoverflow.com/questions/33378548/ffmpeg-crop-a-video-without-losing-the-quality

scale

ffmpeg -i in.avi -vf scale=320:-1 out.avi

see: https://trac.ffmpeg.org/wiki/Scaling%20(resizing)%20with%20ffmpeg

trim

without re-encoding

ffmpeg -i in.mp4 -vcodec copy -acodec copy -ss 00:01:00.000 -t 00:00:10.000 out.mp4

with:

• -ss -- start time
• -t -- duration

see: https://vollnixx.wordpress.com/2012/06/01/howto-cut-a-video-directly-with-ffmpeg-without-transcoding/

screenshot

ffmpeg -i in.mp4 -ss 00:00:05.000 -vframes 1 out.png

or in JPG

ffmpeg -i in.mp4 -ss 00:00:05.000 -vframes 1 -q:v 1 out.jpg

q:v between 1 and 31 (1 being the highest)

Convert all xvid videos found into mp4

cd /Volumes/TRANSCEND && find . \( -iname '*.avi' -o -iname '*.divx' \) -exec bash -c 'ffmpeg -i $0 -c:v libx264 -crf 19 -c:a aac -b:a 192k -ac 2 ${0%.*}.mp4' {} \;

Remove sound

ffmpeg -i myvid.mp4 -c copy -an myvid-nosound.mp4