curl ifconfig.me
Ever needed to grab the public IP of the device you are on via terminal? This neat command will do the trick! curl ifconfig.me
Category Archives: Programming
The White Space Phenomenon
As a developer, one of the worst problems to encounter is the white space problem. In recent memory I’ve encountered this 2 times. Once in 2013 when integrating with MYOB, a trailing white space at the end of a variable caused an http 400 error which was a complete mystery at the time. The second time… Read More »
Connecting to Bitbucket Server via SSH
It can seem daunting at first, but connecting to a git server via SSH can be performed in a few easy steps. The idea is that with SSH, you create a public/private key pair that does the authentication for you so there is no need to type your password each time you want run git… Read More »
To build from source, binary or tarball?
It’s a lot quicker and less hassle to build from a tarball but lets face it, it’s just not as fun :). Let’s go through a simple sample process. There is an open source code call cpuminer that turns your computer into a bitcoin miner. Back in the days, this is how bitcoin mining all… Read More »
Basics of OSX .bashrc v .profile v .bash_profile
The key to understanding what all this means it is important first understand the difference between a login shell and a non-login shell. Types of Shells A login shell is when you are logging in remotely to another machine via ssh. You generally need to login. A non-login shell is when you are already logged into… Read More »
Need to learn about structures in C?
Very neat resource and clear explanations with diagrams. https://www.cs.swarthmore.edu/~newhall/cs31/resources/C-structs_pointers.php
An array of pointers or a pointer of arrays?
There is a very subtle difference in the following: int *myarray[10] v’s int (*myarray)[10] The first declaration is interpreted as an array of 10 integers, that are pointers. That is you have 1 array holding 10 pointers that are of type integer. The square brackets have a higher precedence so the myarray[10] gets defined first.… Read More »
An excellent reference for learning C pointers
Learning about pointers in C is no mean feat. It may seem logical and obvious to the well trained but to the beginner or newbie, it is a challenge and a half. Not only that but trying to find good material on learning about C pointers is tricky as well. There is too much information… Read More »
Why is the GNU software manual so hard to read?
I was researching on what “dnl” meant within a configure.ac file and my Google search showed results from http://www.gnu.org/software/m4/manual/m4-1.4.14/html_node/Dnl.html. Thinking this was the authoritative source, upon reading, I couldn’t for the life of me understand it. After searching some more, it was explained very clearly and succinctly at Stack Overflow of all places. http://stackoverflow.com/questions/3371239/autoconf-dnl-vs In configure.ac, lines commented with… Read More »
How to view va_list variables via gdb
Viewing variable values via gdb of a va_list is not as straight forward as gdb> p myvar. It requires a few extra steps not only in execution but in understanding. Read on if you want to know how va_* works and how to view the underlying variables. Step 1: The first step is to understand… Read More »