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How to Write a Shell in C
It’s easy to view yourself as “not a real programmer.” There are programs out there that everyone uses, and it’s easy to put their developers on a pedestal. Although developing large software projects isn’t easy, many times the basic idea of that software is quite simple. Implementing it yourself is a fun way to show that you have what it takes to be a real programmer. So, this is a walkthrough on how I wrote my own simplistic Unix shell in C, in the hopes that it makes other people feel that way too. The code for the shell described here, dubbed lsh , is available on GitHub . University students beware! Many classes have assignments that ask you to write a shell, and some faculty are aware of this tutorial and code. If you’re a student in such a class, you shouldn’t copy (or copy then modify) this code without permission. And even then, I would advise against heavily relying on this tutorial. Basic lifetime of a shell Let’s look at a s...
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