Generate Puppet or Chef recipes from a Ubuntu system state

When using form_for you can give the form's target URL either as a string or an array:

form_for(admin_user_path(@user)) do ... end
# same as:
form_for([:admin, @user]) do ... end

Same for link_to:

link_to("Label", edit_admin_u...

Getting a regular expression from a string in JavaScript is quite simple:

new RegExp('Hello Universe');
# => /Hello Universe/

You can also use special characters:

new RegExp('^(\\d+) users')
# => /^(\d+) users/

Our expressi...

We use the whenever gem to automatically update the crontab of the servers we deploy to. By default, whenever will update all servers with a matching role ([we use the :cron role ](https://makandracards.com/m...

To access files from another branch or past commit without doing a complete checkout, you can either use

git show branch:file
git show commit:file

to display, or check out the file into your working directory with

git checkout bra...

When you need information about a gem (like version(s) or install path(s)), you can use the gem binary from the command line, or the Gem API inside a ruby process at runtime.

gem binary (in a terminal)

You can get some information abou...

You configured authentication in your Apache configuration that requires username and password but you want a single IP address, host or network to allow access without entering credentials you can use the code below.

To allow a network you can u...

You can use fold:

fold -sw 60

You can now paste your texts. fold will echo them back, word-wrapped after 60 columns. Exit with Ctrl+C or Ctrl+D.

You can also use files for input and output:

fold -sw 60 input.txt > output.txt

A good tool to generate strong passwords and secrets is "apg". You can get it with

sudo apt-get install apg

To create a strong secret for sessions, [hashed Paperclip paths](https://makandracards.com/makandra/734-deliver-paperclip-attachments...

This is for you when you want to mount a dmcrypt encrypted partition manually, e.g. from a live CD.

First, open the dmcrypted partition (You need to provide some name. It may, but does not need to, be your LVM group name):

cryptsetup luksO...