Step 1: Add Mongodb to your sources.list.d (for Ubuntu 14.04) This allows you to get the latest files from mongodb.org when you run sudo apt-get install echo “deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.0 multiverse” | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list Step 2: Reload the local package database sudo apt-get update Step 3: Install MongoDB sudo apt-get install -y mongodb-org -y automatically… Read More »
Step 1: Stop the service sudo service mongod stop Step 2: Remove packages sudo apt-get purge mongodb-org* Step 3: Remove data directories sudo rm -r /var/log/mongodb sudo rm -r /var/lib/mongodb -r means recursive Reference: https://docs.mongodb.org/v3.0/tutorial/install-mongodb-on-ubuntu/
A simple concept in the C language is the evaluation of a boolean expression with an if statement. But what if the condition is not a typical relational or boolean expression? In C, it is possible to write: if (x){ // if x is true or great than zero printf(“x is true/has a value/great than… Read More »
Fantastic book. Highly recommend. 400 pages with solid references. Takes you on a whirlwind tour back in time. Gripping few days of reading.
Came across this detailed paper “What Every Programmer Should Know About Memory” by Ulrich Drepper dated 21 November 2007. (http://www.akkadia.org/drepper/cpumemory.pdf) It is a long read but provides a wealth of background which explains some good fundamental concepts that are still valid today. Another article, http://marek.vavrusa.com/c/memory/2015/02/20/memory/ puts another “practical” spin on the original paper and is also… Read More »
If you encounter this error in Eclipse check if you are declaring a function within a function. Nested functions are available as a language extension in GCC but not part of the standard language. So the next time you see ‘invalid storage class for function ‘blah’, do a quick check on where you have defined… Read More »
http://stackoverflow.com/questions/1433204/how-do-i-use-extern-to-share-variables-between-source-files-in-c
I had a dedicated key for auto rotate on/off on my laptop which worked in Windows but in not Ubuntu. I’m glad because I got to learn a new command called xrandr. I remember this by thinking of x random r. It is really neat and I recommend you running these commands and experiment. These… Read More »
If you are running a Bitcoin node on one of your servers that has an internal IP of 192.168.1.x then you’ll know you can hit the API using localhost or 127.0.0.1 But what if you want to make a JSON-RPC call from another computer from with your local network? If it is not configured, you’ll… Read More »