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    <p>@Dlinet, you are trying to learn some useful lessons on how to organize a program. I won't post code because there is already a really excellent answer; I cannot possibly improve upon it. But I would like to recommend a book to you.</p> <p>The book is called <em>Software Tools in Pascal</em>. The language is Pascal, not C, but for reading the book this will cause no serious hardship. They start out implementing simple tools like the one in this example (which on UNIX is called <code>cat</code>) and they move on to more advanced stuff. Not only do they teach great lessons on how to organize this sort of program, they also cover language design issues. (There are problems in Pascal that really vex them, and if you know C you will realize that C doesn't have those problems.)</p> <p>The book is out of print now, but I found it to be hugely valuable when I was learning to write code. The so-called "left corner design" methodology serves me well to this day.</p> <p>I encourage you to find a used copy on Amazon or wherever. Amazon has used copies starting at $0.02 plus $4 shipping.</p> <p><a href="http://rads.stackoverflow.com/amzn/click/0201103427" rel="nofollow">http://www.amazon.com/Software-Tools-Pascal-Brian-Kernighan/dp/0201103427</a></p> <p>It would be an educational exercise to study the programs in this book and implement them in C. Any Linux system already has more-powerful and fully-debugged versions of these programs, but it would not be a waste of your time to work through this book and learn how to write this stuff.</p> <p>Alternatively you could install FreePascal on your computer and use it to run the programs from the book.</p> <p>Good luck and may you always enjoy software development!</p>
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    1. POClearest way to read and print .txt file lines in C
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    1. USsteveha
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    1. CO+1: I learned a lot from the original [Software Tools](http://www.amazon.com/Software-Tools-Brian-W-Kernighan/dp/020103669X/) (written using Ratfor — Rational Fortran). That, along with [The Elements of Programming Style](http://www.amazon.com/Elements-Programming-Style-Brian-Kernighan/dp/0070342075) were very formative books for me, all those many years ago (30 of them, and a maybe a few to spare). But this is somewhat tangential to the direct question.
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      1. USJonathan Leffler
 

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