What happens when we do a system call?

http://arunasujith.blogspot.in/2012/02/what-are-these-system-calls.html

How people in Google code?

http://googletesting.blogspot.in/2008/07/how-to-write-3v1l-untestable-code.html

Useful Java links

https://github.com/Vedenin/useful-java-links/blob/master/readme.md

What is eliding mergeinfo in SVN?

Read the section "Subtree Merges and Subtree Mergeinfo" under Basic Merging. It is basically removing the redundant subtree mergeinfo as the needed mergeinfo information is already present in parent's mergeinfo.

That is, for example, if parent X mergeinfo has values x,y and z, the child of X doesn't need to maintain the x,y and z mergeinfo values.

Script to do svn merge

1st argument is the URL you want to merge from.
2nd argument is the svn log's begin date.
3rd argument is the svn log's end date.

Why IP is called connectionless protocol and TCP is called as connection-oriented protocol?

Answer

http://stackoverflow.com/questions/4533686/why-do-we-say-the-ip-protocol-in-tcp-ip-suite-is-connectionless

This has nothing to do with wired or wireless networks.

Need for IP addresses

Problem Statement:

Why do we need IP addresses in the first place as we already have ample amount of unique Ethernet addresses.

Reason:

Ethernet addresses are unique physical address whereas IP addresses are unique logical address across the world. So, grouping of machines under a single sub-net is very easy compared to Ethernet addresses. Machines can be added/removed easily in sub-net consisting of machines having logical IP addresses.

Also, for each group of IP addresses, it is easy to enforce restrictions. ISPs know which set of IP addresses is allocated for which country and so, it becomes easy for them to block certain contents.

Also, as mentioned in https://www.quora.com/When-a-MAC-address-itself-is-unique-why-do-we-still-need-an-IP-address-to-uniquely-identify-a-system-on-a-network, it is easy to build routing table based on IP addresses as MAC address contains no information about machine's location.