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kubectl auth can-i list secrets --namespace dev --as dave

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# foo.service
[Unit]
Description=do something

[Service]
Type=oneshot
ExecStart=/usr/bin/script1
ExecStart=/usr/bin/script2

[Install]

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#!/bin/sh
set -exuo pipefail
# An example hook script to verify what is about to be committed.
# Called by "git commit" with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.
#
# To enable this hook, rename this file to "pre-commit".

# do some validation here e.g.

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# create dockerconfigjson from scratch

cat <<EOF >> dockerconfigjson
{
	"auths": {
		"https://index.docker.io/v1/": {
			"auth": "$(base64 --input=credfile)"
		}
	}
}

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# create dockerconfigjson from scratch

cat <<EOF >> dockerconfigjson
{
	"auths": {
		"https://index.docker.io/v1/": {
			"auth": "$(base64 --input=credfile)"
		}
	}
}

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# manual
certbot --help all

# Add Certbot PPA
sudo apt-get update -y
sudo apt-get install -y software-properties-common
sudo add-apt-repository universe
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update -y 

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INSTANCE_CONNECTION_NAME: <projname>:<region>:<db-instance-name> (myproject:us-central1:myinstance)

# tcp socket 
/cloud_sql_proxy -instances=<INSTANCE_CONECTION_NAME>=tcp:<port-number> \
                 -crendential_file=<PATH_TO_KEY_FILE>
psql "host=127.0.0.1 sslmode=disable dbname=<DB_NAME> user=<USER_NAME>"

# unix socket
sudo mkdir /cloudsql; sudo chmod 777 /cloudsql
# service account based (explicit instance)

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echo '{"facility": "testfacility", "short_message": "test message"}' | nc -w 2 -u <endpoint> <port>

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# customise output format with go template
kubectl ... -o go-template --template="{{range .items}}{{range .spec.containers}}{{.image}} {{end}}{{end}}"
kubectl get deploy -o go-template --template='{{range .items}}{{printf "%s\n" .metadata.name}}{{end}}'

# for keys with dots or special characters
kubectl get secrets regcred -o "jsonpath={ .data['\.somesecret'] }"

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# list of commands useful for scripting
# there are other shorter but gives less precise command mainly for human consumption
# rather than scripts. those commands are not the focus of this gist

# accidentally tracking a large repo via git fetch
# and to stop tracking unused remote branches
git br -d -r <branch-name>

# to remove everything in one command
git br -r | xargs git br -d -r