Ikenna’s blog

You have committed to your local repository, and pushed to the remote repo. Now you want to undo that commit (a bit similar to a subversion revert). Do

hg backout -m 'back out change' tip

See this for more details :

http://hgbook.red-bean.com/read/finding-and-fixing-mistakes.html

See 10 Tips to Increase IntelliJ IDEA Performance

Ctrl+W twice switches between the project pane and the file editing buffer when using the VIM project plugin . Found this after lots of Google searching from Ariyas blog post about using the project plugin.

Here are a few helpful articles
http://www.markcarter.me.uk/computing/linux/oracle.htm
http://www.oracle.com/technology/tech/linux/install/xe-on-kubuntu.html

I installed Oracle XE on a Virtual Machine. I did come up with 2 issues -
1. The VM had 512Mb of RAM and oracle needed more. Had to increase the swap space. This page gives instructions on doing this on ubuntu.
2. The VM was on an internal network, and could be accessed by its IP but not its hostname. This made the post-install oracle configuration tasks to fail (found this out through oracle’s install logs). So even if Oracle XE was installed, you could neither access it through sqlplus or through its web-based admin interface. We fixed this by changing the VM’s hostname to localhost, then un-intsalling and re-installing oracle XE.

And then don’t forget to run

after the installation!

Need to parse csv files in ruby, skipping the first row (usually some header)?. Use FasterCSV. (Yes, its faster). Install it

Here is one solution

#!/usr/bin/ruby -w

require 'rubygems'
require 'faster_csv'

#put everything in an array
array_of_arrays = FasterCSV.read("some_file.csv") 

# remove headers
array_of_arrays.slice!(0) 

array_of_arrays.each{|row|
  puts row
}

Another solution is

#!/usr/bin/ruby -w

require 'rubygems'
require 'faster_csv'

# setting the headers option to true or :first_row gets rid of the headers
FasterCSV.foreach('some_file.csv', :headers => :first_row) {|row|
    puts row
}