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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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Do you need to convert the lines into one long csv line or lines with 4 items. Be sure to test any solution you come up with with various inputs. Does it break with only 2 lines. Does it produce as comma at the end. What do you do about blank lines? Maybe the input file will have a trailing blank line. Maybe the last line won't end with a newline.
Guys, this is clearly homework. It does nothing good for the poster to give the answer, instead of guiding him/her to one. I was going to rant at those who broke this unofficial LQ rule, until I looked at the answers given. -- Unless I am mistaken, all are either in the wrong language (I hope deliberately), or broken.