These instructions show how to install pip and virtualevn on a Mac running Snow Leopard 10.6.8 and using Python 2.7. I used this to install Django 1.3.1 (installation instructions included). Installing pip (skip if you have pip installed) First make…
Here’s a game I like to play. Select two wikipedia pages at random, and find a route from one to the other. I stated a theorem once that: you can get from any page on wikipedia to the page on…
This howto shows how to get Nagios up and running on an Amazon EC2 Instance using Apache web server to serve the Nagios UI. You could argue that a more light-weight web server would be better, but I’d argue that…
Google Fusion Tables is a service for storing tabular data online. It has an API that allows you to make an SQL-like request for data from an online table, like the following: sql=SELECT * FROM 1906375 (clicking the link will…
Introduction to CORS CORS (Cross Origin Resource Sharing) is a mechanism specifies by W3C (draft), for allowing browsers to make cross origin requests for resources on other domains under certain conditions. It’s related to JSONP because it solves a similar…
Place each word on a separate line with sed and awk: sed -e ‘s/[^[:alpha:]]/ /g’ | awk ‘{ for (i=1;i
I read somewhere that if you take a list of words reverse the letters in each word sort the (reversed) words alphabetically then reverse the words back to normal
I keep forgetting how to do this. How to group on a date column (date_col in the example) in Oracle: SELECT count(*) FROM table GROUP ON TO_CHAR(date_col, ‘DD-MON-YYYY HH:MI:SS’) For other format strings than ‘DD-MON-YYYY HH:MI:SS’ see this page.
In this example I had a big log file (many million lines), that I wanted to split into smaller logfiles (each one million lines) for processing on Elastic MapReduce. -rw-r–r– 1 kostas staff 543067012012 Oct 11 13:45 huge_logfile This is…
Completely off topic. Just a thought, is this what China will look like in a few years? A country of old people, governed by the children of the one-child policy era… Wonder how that will affect the current financial situation…