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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God’s Own Kitchen by Rashmi Bansal

I had read two other books from Rashmi Bansal which i had liked. Based on my opinion about previous books, read this book too and i was not disappointed. Book is about “Akshaya Patra” program by ISCON temple. For all who have not heard about Akshaya Patra, it’s a program which sponsors meal in government schools and places near factories throughout India. It was started in Bangalore for 1000+ school children and has reached 1.5 million meals a day spread across India. Author has explained about the program from day 1 when it was started in year 2000 for about 1000+ children’s and how it could scale to 1.5 million meals per day till now. There will be social and financial problems for any organization and Akshaya Patra has also gone through this. Serving thousands of meals everyday with only money raised from charity is a challenge and Akshaya Patra has gone through financial crisis at times. In one such circumstance, instead of stopping the meal program, they have taken a brave effort to take loan and continue the program which is notable. After initial struggle, state governments recognized the effort of the organization and are contributing to the program by providing raw material/ingredients for meals which has reduced the cost per meal. With the money raised from charity and support from state governments, Akshaya Patra is able to continue serving meals day after day without a break.

Serving 1.5 million meals a day is a remarkable achievement. Surprisingly, each meal cost is 6 Rs/- only inclusive of transportation cost of taking the meal to schools and other locations. Most of the people working in ISCON are volunteers and do not take any salary for the job. This also contributes for low cost of meals. To sponsor a child meal for an entire year it cost’s around 1000 Rs/-. Government of Karnataka and Tamilnadu have started Amma Canteen and Indira Canteen which serve meals at low cost couple of years back. But Akshaya Patra is doing it from year 2000. This is something which all state governments can replicate to provide good food at low cost.

I am very much impressed with the program and it’s mission. I will be doing my part my contributing to Akshaya Patra. I urge others also to contribute for the program too with this writing. If you are convinced about the program, you can contribute to the mission of Akshaya Patra at click of a mouse @ https://www.akshayapatra.org/ .

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