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Unix
An influential family of operating systems whose design shaped Linux and much of modern server computing
What's it for?
Provides the older operating-system ideas and tools that still underpin many modern servers and developer environments.
For example…
A bank still has a Unix box running a settlement job; engineers ssh in with the same muscle memory they use on Linux.
An administrator on a Unix-like system combines small command-line tools to search logs, filter matching lines and count errors
Think of it like…
Latin for operating systems: few speak the original daily, but the descendants still share the grammar