Want to make your git experience literally colorful? :D Add the following to your global options

>> git config --global color.interactive always
>> git config --global color.diff always
>> git config --global color.status always
>> git config --global color.branch always

To explore other global options,

>> git config --help

To explore your current global options

>> git config --global --list

While I was migrating my wife's site to Rails 3 on Heroku, I encountered the following error

Installing linecache19 (0.5.11) with native extensions /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/installer.rb:483:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

To solve the problem above, add a config variable in heroku specifying that gems listed under a specific group should not be installed.

heroku config:add BUNDLE_WITHOUT="development test"

So adding the code above will skip gems under the development and test groups.

Usually, companies acquire multiple domains and point them to one application. In these cases, the company would want to use a 301 redirect to change the url to the one they want indexed by search engines.

In nginx, you can do a 301 redirect by following my other post. It would've been easy if "if" blocks in nginx support conditional operators like || or && (in most programming languages).

To get around this, we use the set command to set a value to a variable, and set that variable's value if the host matches one of the alias. To better illustrate, suppose we're given 4 domains:

www.example.com
example.com
www.example.org
example.org

If the domain we want indexed by search engines is www.example.com, then our config file should look like

server {
  listen 80; 
  server_name www.example.com example.com www.example.org example.org;

  set $my_var 0;
  if ($host = 'example.com') {set $my_var 1;} 
  if ($host = 'example.org') {set $my_var 1;}
  if ($host = 'www.example.org') {set $my_var 1;} 

  if ($my_var = 1) {
    rewrite ^/(.*)$ http://www.example.com/$1 permanent;
  }
}