Books Books n Books

I left my previous organisation Microfocus (formerly Hewlett Packard Enterprises) and all of a sudden i had ample time to do whatever i want. Started reading again and read couple of books before actual work started in my new company (Oracle). This time not physical copy of books but in Kindle (Thanks to my brother Dr. Ravi who lent it to me). Bought Kindle unlimited plan and read

a. Think Straight by Darius Foroux – goodread

b. Win your own battles by Darius Foroux – goodread

c. 30 Interactive brain teasers by Puzzleland – goodread

d. The four hour work week by Timorty Ferriss – goodread

e. Top 10 Fixed return option trading strategies byKavita Mehatani – goodread

f. Day Trading made easy by Latthew R Kratter – goodread

6 books in a span of month. Felt really good. What next ? Started reading for stuff required for new job 🙂

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File and Directory permission

What’s the default permission of newly created file/directories in unix ? This can be different in different hosts based on umask value.
Each OS has default permission for newly created files and directories. But this can be changed using umask. umask value can be changed by administrators so that the default file/directory permission are different than the one used by OS. Following two articles provide explanation of umask and it’s affect on newly created file/directory permission.

    https://www.computerhope.com/unix/uumask.htm
    http://wintelguy.com/umask-calc.pl
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Catalyst

by Chandramouli Venkatesan

A must read for all professionals. This is one of the top rated books and I would recommend all to read.
I am sure one can make lot of corrections in his/her career from where they stand now and move higher up in the ladder by adopting the principles explained in book.

Thanks a lot to Chandramouli for such a wonderful career guidance book.

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I Have a Dream

by Rashmi Bansal
Who is an entrepreneur?. is it only individuals who have built big corporate’s? No, there are many social entrepreneurs whom we do not know about.

Author has provided details of 20 social entrepreneurs who have done exceptional work for the good of society. There are so individuals around us with selfless motive serving for the betterment of society. I was really surprised with the commitment of these individuals. I think, if these individuals were in politics, our society would have improved to a great extent.
Most of them have built organizations/NGOs which serve for betterment of backward class citizens with their time, effort and money. These social entrepreneurs have studied in IIT and IIM’s and have taken up the task of serving the society which is really surprising. If they would have taken up a corporate job, i am sure they would have earned better name and fame. This boils down to, whatever it may be “follow your dream”.
I am sure, with the help of these organizations many individuals would have reached greater heights or are having a better standard of leaving. Thanks to all the social entrepreneurs.

Personally i appreciate all the work these individuals have done and will try to keep my social commitment too.

This is definitely a book to read.

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Distributed System

I have viewed all 24 lectures (link below) of “Distributed Systems” by Prof. Keshav, Waterloo University and would recommend all who are interested in the system to listen too. Each of the lecture comes with bundle of information. Prof co-relates most of the use cases with real life scenarios which makes it easy to understand and remember. I am sure, listening to the lecture will definitely enhance the knowledge on the subject.

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Java Collections comparision

If you are looking for comparing various java collections, here it goes

Source:
https://zeroturnaround.com/rebellabs/java-collections-cheat-sheet/

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RPO and RTO

Recovery Point Objective (RPO)
refers to the amount of data at risk. It’s determined by the amount of time between data protection events and reflects the amount of data that potentially could be lost during a disaster recovery. The metric is an indication of the amount of data at risk of being lost.
Recovery Time Objective (RTO)
is related to downtime. The metric refers to the amount of time it takes to recover from a data loss event and how long it takes to return to service. RTO refers then to the amount of time the system’s data is unavailable or inaccessible preventing normal service.

Source
http://wikibon.org/wiki/v/Defining_RPO_and_RTO

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