jacekbj

Keybase proof

I hereby claim:

• I am jacekbj on github.
• I am jacekbj_15five (https://keybase.io/jacekbj_15five) on keybase.
• I have a public key ASDdVWs1isy_188RweoYQzarXLsiyKuLgZ53S3eiCqApJQo

To claim this, I am signing this object:

jacekbj

if [ $checksum == "$(md5sum virtualbox-6.1_6.1.32-149290~Ubuntu~eoan_amd64.deb | cut -f1 -d' ')" ]; then
  echo "Equal"
else
  echo "Not equal"
fi

jacekbj

List changed files

git log --stat

Push force but fail if it would overwrite somebody's else changes:

git push --force-with-lease

jacekbj

From https://jeffknupp.com/blog/2016/03/07/python-with-context-managers/. Can be used both as context manager and as function decorator.

from contextlib import ContextDecorator

class makeparagraph(ContextDecorator):
    def __enter__(self):
        print('<p>')
        return self

jacekbj

Install a release

helm install my-installation ./mychart
# dry run
helm install --debug --dry-run my-installation ./mychart
# pass a variable from CLI
helm install --set drink=cofee my-installation ./mychart
# load file with variables
helm install -f ./variables-override.yaml my-installation ./mychart
# set default value to null to remove it

jacekbj

minikube start --driver=virtualbox
minikube status
minikube stop
minikube delete // Removes state from previous run

jacekbj

Format input if it's JSON

some-command | jq -R -r '. as $line | try fromjson catch $line'

Run command in a loop with substitution

array=( one two three )
for i in "${array[@]}"; do commaind $i ; done

jacekbj

convert SVG to PNG with transparency

convert -background none "logo (1).svg" logo-wc.png

resize image (set width to 100px, preserve aspect ratio)

convert in.jpg -resize 100 out.jpg

jacekbj

"Python High Performance" - things I didn't know or forgot about.

I worked on Python web apps, wrote some Tornado code, crunched data in Pandas and PySpark. Hell, I even knitted something together in OpenCV and scikit-learn (university, I miss you). However, no task can ever give you a chance to practice each and every part of language and package ecosystem. It's always good to sharpen your saw, so I decided to refresh my knowledge a bit and get my hands on excellent "Python High Performance" by Gabriele Lanaro. I will share with you my notes, which consist of 3 types of notes:

• snippets I want to keep,
• things I didn't know,
• things I forgot about and I never want to again.

jacekbj

alias fixssh='export SSH_AUTH_SOCK=$(find /tmp -path '*/ssh-*' -name 'agent*' -uid $(id -u) 2>/dev/null | tail -n1)'