dhbradshaw

Postgres on WSL (Windows Subsystem for Linux) ubuntu 18.04

Hint: it's not different than running it under ubuntu without Windows.

Add postgres package registry

sudo apt install postgresql-common
sudo sh /usr/share/postgresql-common/pgdg/apt.postgresql.org.sh

Update apt

dhbradshaw

# Try listing the processes associated with a term, for example guake.
$ pgrep guake
8494

# Kill guake processes without bothering looking at them.
$ pkill guake

dhbradshaw

# Encrypt file
gpg -c --cipher-algo AES256 private-file.txt

# Decrypt it
gpg private-file.txt.gpg

# !!Don't forget the passphrase!!

dhbradshaw

# Source: https://makandracards.com/makandra/527-squash-several-git-commits-into-a-single-commit

# Switch to the master branch and make sure you are up to date.
git checkout master
git fetch # this may be necessary (depending on your git config) to receive updates on origin/master
git pull

# Merge the feature branch into the master branch.
git merge feature_branch

dhbradshaw

Check that your system supports systemd

pidof systemd
2733

If this return a number then your system supports systemd. Most Linux distributions in 2017 support systemd.

Check out the processes currently running.

Since systemd starts the process then all processes will be children of systemd

dhbradshaw

// Get html collection of images:
var imgs = document.getElementsByTagName('img')

// Convert to array
imgs = Array.from(imgs)

// Map to urls
var urls = imgs.map(img => img.src)

// Copy to clipboard

dhbradshaw

function MorseNode(ac, rate) {
    // ac is an audio context.
    this._oscillator = ac.createOscillator();
    this._gain = ac.createGain();

    this._gain.gain.value = 0;
    this._oscillator.frequency.value = 750;

    this._oscillator.connect(this._gain);

dhbradshaw

In [1]: %load_ext autoreload

In [2]: %autoreload 2

In [3]: from core.courses import questions

In [4]: questions.meaning_of_life()
Out[4]: 42

In [5]: "Rewriting method"

dhbradshaw

function query() {
  var 
    // HN is done with very unsemantic classes.
    job_list = Array.prototype.slice.call(document.querySelectorAll('.c5a,.cae,.c00,.c9c,.cdd,.c73,.c88')),
    query_list = Array.prototype.slice.call(arguments),
    shown = 0, total = job_list.length;
    
  // Traverses up the dom stack trying to find a match of a specific class
  function up_to(node, klass) {
    if (node.classList.contains(klass)) {

dhbradshaw

from django.utils import timezone
import pytz

pytz_tz = pytz.timezone('America/Chicago')

# wrong -- The direct approach leads to somewhat random time offsets between timezones.
adt = timezone.datetime(year=2016, month=1, day=6, tzinfo=pytz_tz)

# correct: Localize a naive datetime.
ndt = timezone.datetime(year=2016, month=1, day=6)