AlekseiK Alex-Just

## generators.py
# https://eev.ee/blog/2016/07/31/python-faq-why-should-i-use-python-3/#yield-from
# https://jeffknupp.com/blog/2013/04/07/improve-your-python-yield-and-generators-explained/

# `yield`
# - pauses generator (saves its state) on the current line of code
# - returns yielded value (and control) to the caller
# - receives another `somevalue` from the caller via generator.send(somevalue)

# `yield from`
# - yields an entire sequence

## pyenv.sh
# One-liner
pyenv global 3.5.2 && virtualenv .env -p $(pyenv which python) && . .env/bin/activate && python -V && pyenv global system

# List installed versions
pyenv versions

# Set global version to
pyenv global 3.5.2

# Check current set version

## habr_proxy.py
#!/usr/bin/env python3
# Author: Alex Just <AlexJustEmail@gmail.com>

"""Download target URL, append all 6 letter words with a ™ symbol, and display the outputs in the opened user's browser

Project specification:
    https://docs.google.com/document/d/1bua6MXG9rHyreSPVPEZBkk14WYHy31ia4Vb2rnrgvS0/edit

Installation:
    $ pip3 install bs4 vcrpy

## users.sh
whoami

# Add user to sudoers
sudo adduser <username> sudo

# Switch user
su - user2

# List all local users
cut -d: -f1 /etc/passwd

## update ubuntu packages.sh
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get upgrade

## ssh.sh
ssh-keygen -t rsa

cat ~/.ssh/id_rsa.pub | ssh user@host "mkdir -p ~/.ssh && cat >>  ~/.ssh/authorized_keys"
# or
cat ~/.ssh/id_rsa.pub | ssh-copy-id user@host

ssh-add -K ~/.ssh/id_rsa

# You might need to start ssh-agent
eval `ssh-agent -s`

## requests elapsed time.sh
python3 -c "import requests; proxies = {'http': '127.0.0.1:21233'}; response = requests.get('http://ya.ru', proxies = proxies); print ('Elapsed time: ', response.elapsed)"

## pip.sh
# Upgrading all packages with pip
pip freeze --local | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U

# Pip freeze for only project requirements.txt
pip freeze -r requirements.txt | grep -B100 "pip freeze" | grep -v "pip freeze" > /tmp/requirements.txt && mv /tmp/requirements.txt .

## postgres.sh
# Login as a UNIX user (IDENT/PEER authentication)
sudo -u postgres psql postgres

# Login via PostgreSQL's own managed username/password (TCP authentication)
psql username -h 127.0.0.1 -d dbname

# Switch to postgres user via root
sudo -i -u postgres

# Backup DB

## opened ports.sh
# OSX
lsof -i :8000

# Ubuntu
sudo netstat -peanut
	# https://eev.ee/blog/2016/07/31/python-faq-why-should-i-use-python-3/#yield-from
	# https://jeffknupp.com/blog/2013/04/07/improve-your-python-yield-and-generators-explained/

	# `yield`
	# - pauses generator (saves its state) on the current line of code
	# - returns yielded value (and control) to the caller
	# - receives another `somevalue` from the caller via generator.send(somevalue)

	# `yield from`
	# - yields an entire sequence
	# One-liner
	pyenv global 3.5.2 && virtualenv .env -p $(pyenv which python) && . .env/bin/activate && python -V && pyenv global system

	# List installed versions
	pyenv versions

	# Set global version to
	pyenv global 3.5.2

	# Check current set version
	#!/usr/bin/env python3
	# Author: Alex Just <AlexJustEmail@gmail.com>

	"""Download target URL, append all 6 letter words with a ™ symbol, and display the outputs in the opened user's browser

	Project specification:
	https://docs.google.com/document/d/1bua6MXG9rHyreSPVPEZBkk14WYHy31ia4Vb2rnrgvS0/edit

	Installation:
	$ pip3 install bs4 vcrpy
	whoami

	# Add user to sudoers
	sudo adduser <username> sudo

	# Switch user
	su - user2

	# List all local users
	cut -d: -f1 /etc/passwd
	sudo apt-get update
	sudo apt-get dist-upgrade
	sudo apt-get upgrade
	ssh-keygen -t rsa

	cat ~/.ssh/id_rsa.pub \| ssh user@host "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"
	# or
	cat ~/.ssh/id_rsa.pub \| ssh-copy-id user@host

	ssh-add -K ~/.ssh/id_rsa

	# You might need to start ssh-agent
	eval `ssh-agent -s`
	# Upgrading all packages with pip
	pip freeze --local \| grep -v '^\-e' \| cut -d = -f 1 \| xargs -n1 pip install -U

	# Pip freeze for only project requirements.txt
	pip freeze -r requirements.txt \| grep -B100 "pip freeze" \| grep -v "pip freeze" > /tmp/requirements.txt && mv /tmp/requirements.txt .
	# Login as a UNIX user (IDENT/PEER authentication)
	sudo -u postgres psql postgres

	# Login via PostgreSQL's own managed username/password (TCP authentication)
	psql username -h 127.0.0.1 -d dbname

	# Switch to postgres user via root
	sudo -i -u postgres

	# Backup DB