Friday, September 19, 2014

How to Create Complex directory Tree Using mkdir -p Command in UNIX

One of the most common task in any Linux is creating directories, and most of us spend a lot of time creating complex directory structure in UNIX.  I am sure you know about mkdir command, we have been using this command in almost every operating system e..g DOS, Windows, Linux, OS/2, Solaris or many other *NIX operating system. It is one of the basic command but as important as find, grep or chmod.  mkdir stands for "make directory" and this command is literally used to create directories. Suppose, you need to create a directory tree like /opt/software/java/app/config, how are you going to create these directories? One by one right? Well, yes you can use mkdir and command to create these directories one by one as shown in below example :

Wednesday, September 17, 2014

10 Questions To Make Programming Interviews Less Expensive

Conducting Interview is not cheap and costs both time and money to a company. It take a lot of time to find the right candidate for a job from 100s resume you receive from consultants and agents. They will always tell you that this guy is a Java Guru, this one is SQL Expert and next one is the full stack developer you are looking for. If you have trust them blindly and invite all of them for face-to-face interview, you are going to be disappointed. One of the first thing you should do is to filter candidates who claims to have certain skills e.g. SQL but doesn't have them, the faster you can weed out those candidates the cheaper will be the hiring process. A phone screening interview is just for that purpose, it doesn't cost you much and also suitable for candidate, as they don't have to take off and come down to your office. It's flexible for both the parties. When I phone interview someone, I spent fist few minutes to listen them and then I go for my list of weed out programming question to see if candidate is good enough to spend another 30 to 40 minutes. They have saved a lot of time, where I found out that candidate having words like "Strong knowledge of Java", "Exceptional in SQL" and "Programming gurus" fail to answer these simple questions. If you are a candidate and gone through couple of interviews, you might have noticed that almost all interviewers make up their minds in the first 10 minutes. The rest of the interview gives them reasons supporting said decision, but not all is lost. If you ever feel that you have messed up with your chance, try coming of some really good answers on rest of questions, if you can impress interviewer to an extent that encourage you to go deep, you may be able to change his initial decision. To get some feedback and improve upon my method, I have decided to share my list of weed out programming questions (don't bother about sharing questions, I have many similar questions on my secret question bank and you can create them easily as well). I have chosen one or two question from common programming skill set e.g. Java, SQL, XML, Programming, Coding, OOPS, Multi-threading and UNIX. I am looking forward to know what you guys do, what do you ask to check same skill set before calling candidates for face to face interviews. Comment if you agree or disagree.

Monday, September 15, 2014

6 Books to Learn and Master Programming and Coding - Must Read

Coding is an integral part of programming and we all somehow learn coding by following examples here and there. What is more difficult is to write good code. You can easily find programmers in Java, C++, Ruby or Python, but finding programmers, who are also good coder is very difficult. Some universities has good curriculum and practical classes to teach coding better than others, but most of these great codes are self-taught. Point is self learning is VERY important in field of Programming and Coding, you just cannot rely on your college and university to make you an expert programmer, you have to make that extra effort to distinguish yourself from the group. What could be best by learning coding and wisdom of programming form those who have gone through the same path. Uncle Bob is big advocate of clean coding and object oriented design, and as much I have learn about coding and programming from his series of books, I have not learned anywhere. Martin Fowler is another great name in software design, development and testing, and his book on Refactoring is must read for any serious programmer. Recently I come across an infographic about 10 Books That Make You Expert in Programming. Though I don't agree with all the books they have there, I definitely agree with the top 6 and the last book, which is an all time classic on design patterns. I thought to share that with you guys, If you are more inclined to web programming you will also find rest of the books more valuable, but If you are server side Java programmer, you will definitely find top 5 worth reading.