hivehand

#! /usr/bin/env ruby

# Take a network SSID as an argument, and prompt for the corresponding
# password. Generate a WiFi-network credential set suitable for QR
# encoding as defined in:
#
# https://github.com/zxing/zxing/wiki/Barcode-Contents#wi-fi-network-config-android-ios-11
#
# then generate that QR code and save it to `<SSID>-QR.png`.
#

bradfitz

package main

import (
	"database/sql"
	"flag"
	"fmt"
	"html"
	"io"
	"io/ioutil"
	"log"

adam-hanna

Introduction

I often find myself ssh'ing into my servers and checking my systemd service logs with $ journalctl -f -u {name}.service. One day I got tired of this and wanted all of my important logs in once place (Amazon AWS Cloudwatch). To my dismay, there weren't any real good tutorials on how to do so. So, voilà.

Steps

Overall, it's a fairly simple process consisting of the following few steps.

1. Modify the service file

Open the service file with $ sudo vi /lib/systemd/system/{name}.service

Modify the [Service] section:

simonmichael

; An example of YNAB-ish envelope budgetting with hledger/ledger
; cf https://github.com/simonmichael/hledger/issues/315

; Using accounts like the following:
;
; assets
;   business
;     bank
;       wf
;         bchecking

need12648430

def ago(elapsed):
	o = []
	
	for unit, size in [("yr",365*24*60*60),("mo",30*24*60*60),("wk",7*24*60*60),("d",24*60*60),("hr",60*60),("min",60),("sec",1)]:
		if size > elapsed: continue
		
		total = int(elapsed / size)
		elapsed = elapsed % size
		
		o.append(str(total) + unit)

Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

schickling

require "active_record"

namespace :db do

  db_config       = YAML::load(File.open('config/database.yml'))
  db_config_admin = db_config.merge({'database' => 'postgres', 'schema_search_path' => 'public'})

  desc "Create the database"
  task :create do
    ActiveRecord::Base.establish_connection(db_config_admin)

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

Chase-san

<?php /* Copyright(c) 2013 Robert Maupin. Released under the ZLIB License. */
if(count($_FILES) > 0) {
	extract($_FILES['file']);
	list($w,$h,$type)=getimagesize($tmp_name);
	/*see exif-imagetype() documentation :) */
	if(!$type||$type>3||filesize($tmp_name)>1024*200)
		exit();
	$ext=image_type_to_extension($type,false);
	$md5=md5_file($tmp_name);
	move_uploaded_file($tmp_name,$n="img/$md5.$ext");

paneq

namespace :db do
  def local_database?(config, &block)
    if config['host'].in?(['127.0.0.1', 'localhost', '192.168.30.1']) || config['host'].blank?
      yield
    else
      $stderr.puts "This task only modifies local databases. #{config['database']} is on a remote host."
    end
  end
end