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find . -type f -exec file --mime {} \; | grep -v us-asci

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Pipe to a file using sudo

The tee -a command will append changes to a file (just like to >>). The -a flag stands for "append".

echo "some text" | sudo tee -a write-protected.txt

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Make /robots.txt aware of the Rails environment

You probably don't want Google crawling your development staging app. Here's how to fix that.

$ mv public/robots.txt config/robots.production.txt
$ cp config/robots.production.txt config/robots.development.txt

Now edit config/routes.rb to add a route for /robots.txt, and add the controller code.

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SQL Date Formatting

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Docker Basics

There are two programs:

1. The docker daemon - a server process which manages all the containers
2. The docker client - a remote control for the daemon

You can list the commands of the docker client by typing docker with no arguments.

You can use container images which have been created by other people. You find them online in the docker index. You can search for images using docker search [keywords].

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Upstart

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.vimrc Tips and Tricks

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Technical Interview Notes

Sites for practice

• Code Eval
• CoderByte
• theReq Ruby questions

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Gzip assets when deploying with capistrano and Rails 4.2

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# A sample Gemfile
source "https://rubygems.org"

gem "activerecord"
gem "sqlite3"