Sometimes you just want to have a small web server that serves files to test something. Serve the current directory...

When you're developing a gem, never list the same dependency as both runtime and development dependency in your .gemspec...

While you can use Apache as a reverse proxy, it tries to be too smart. Try nginx instead, it's...

There are many solutions, but a very concise one is this: hash.merge!(hash) do |key, old_value, new_value|

A list of common computer I/O actions and how long they take. Visual comparison chart: http://i.imgur.com/k0t1e.png

git rebase -i -> mark your commit with edit git reset HEAD~ (remove the marked commit, but keep its...

One useful postgres command I stumbled upon recently was \x. It gives you an expanded display which allows you to...

Now that CarrierWave is no longer maintained, Shrine might be worth a look.

Nobody needs HTML e-mails. However, you occasionally might have to write an HTML message for some weird reason. Here...

A great walkthrough through several design iteration of the same landing page.

By pressing Ctrl + Shift + V you can select a recently copied string for pasting.

You can configure RSpec 3.3+ to raise an error when attempting to stub or mock a non-existing method. We...

This is basically Ruby-native syntax for andand.

Sending a testmail from a server with a configured exim is easy as pie. From your usershell: tell exim that...

When you make a simple TCP connection to a remote server (like telnet), your client won't normally notice when...

Installing SSL certificates usually implies additionally using intermediate certificates. If one of them is missing, some SSL client implementations might...

Utility methods to distribute each or map over multiple threads or processes.

If you get an error like: subprocess installed post-removal script returned error exit status 78 when installing/removing/updating a package...

If you have jQuery code like this: if (condition) { $element.show(); } else { $element.hide(); } ... you can shorten this to: $element.toggle(condition);

You want to test your 1GE or 10GE internet uplink? We needed to ensure we have full 10GE to the...

When dealing with AR scopes, you can remove conditions, order, etc by using the unscope method. It is available on...

You can say this in Javascript: $.fn.jquery => "1.11.1"

You cannot find your account passwords in the Account Settings – that'd be too easy. Here is where you find...