Essentially it’s a command shell that was initially written for the GNU project as a replacement for the Bourne shell. But if you don’t, here is a quick explanation. If you have experience with Unix-based operating systems then you probably already know about the Bash shell. I bet you could tell me how to do it in your favorite programming language, but what if you had to do it in Bash? It's not as obvious in Bash as it is in other languages, so we'll explain how to do it a few different ways in this article. Strings are one of the most common data structures, so this comes up often. Throughout your programming career you'll find that there are quite a few times you need to extract a substring from another string.
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