Igor Skrynkovskyy h2rd

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

The PHP IP Guide

This guide shows you common practices to convert IPv4- and IPv6-Addresses into their binary representation.

Who is responsible for this ?

This guide has been written by Matthias Kaschubowski, a autodidactical software developer from germany with about 14 years of practice converting coffee to code. He works in his free time as a php evangelist on a lot of platforms ( last shown as tr0y on php.de, a german PHP related forum and as himself as an adminstrator at the largest PHP-related facebook group ).

Basics

Revert the full commit

Sometimes you may want to undo a whole commit with all changes. Instead of going through all the changes manually, you can simply tell git to revert a commit, which does not even have to be the last one. Reverting a commit means to create a new commit that undoes all changes that were made in the bad commit. Just like above, the bad commit remains there, but it no longer affects the the current master and any future commits on top of it.

git revert {commit_id}'

About History Rewriting

Delete the last commit

Deleting the last commit is the easiest case. Let's say we have a remote origin with branch master that currently points to commit dd61ab32. We want to remove the top commit. Translated to git terminology, we want to force the master branch of the origin remote repository to the parent of dd61ab32:

How to change your commit messages in Git?

At some point you’ll find yourself in a situation where you need edit a commit message. That commit might already be pushed or not, be the most recent or burried below 10 other commits, but fear not, git has your back 🙂.

Not pushed + most recent commit:

git commit --amend

This will open your $EDITOR and let you change the message. Continue with your usual git push origin master.

How to delete Sidekiq jobs in a Rails app using ActiveJobs

Sidekiq jobs can be enqueued or scheduled. Enqueued means that they are gonna be picked up as soon as possible, scheduled jobs will be enqueued at some specific time.

job_id and jid

When using ActiveJobs, Rails will return a job_id after sending the job to ActiveJobs

job = UserMailer.send_invite(params).deliver_later

	server {
	listen 80 default_server;

	server_name example.com www.example.com;

	access_log /srv/www/example.com/logs/access.log;
	error_log /srv/www/example.com/logs/error.log;

	root /srv/www/example.com/public;
	index index.php index.html;

	#!/bin/bash
	# Are you using Mac OS X?
	# You need to install coreutils for this to work.
	# try `brew install coreutils`
	# or `sudo port install coreutils`

	# set a part size that works with FAT32 drives
	PART_SIZE=3999

	# nice little intro


	FILE SPACING:

	# double space a file
	sed G

	# double space a file which already has blank lines in it. Output file
	# should contain no more than one blank line between lines of text.
	sed '/^$/d;G'

	set :rbenv, '"$HOME/.rbenv/shims":"$HOME/.rbenv/bin"'

	job_type :rake, 'cd :path && PATH=:rbenv:"$PATH" :environment_variable=:environment bundle exec rake :task --silent :output'
	job_type :runner, 'cd :path && PATH=:rbenv:"$PATH" bin/rails runner -e :environment ":task" :output'

	set :output, 'log/whenever.log'



	## Useful Commands

	Get kubectl version

	kubectl version

	Get cluster info: