chore: imported knowledge from https://betterprogramming.pub/6-more-terminal-commands-you-should-know-3606cecdf8b6

knowledge base/cmp.md

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+# `cmp`
+
+Compares two files byte by byte.
+
+Prints the line and the character number where the two files diverge.
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL;DR
+
+```sh
+# Print only lines present in both file1 and file2.
+cmp 'path/to/file1' 'path/to/file2'
+```
+
+## Further readings
+
+- [`comm`][comm]
+- [man page]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- [6 more terminal commands you should know]
+
+<!--
+  references
+  -->
+
+<!-- project -->
+<!-- article sections -->
+[further readings]: #further-readings
+
+<!-- knowledge base -->
+[comm]: comm.md
+
+<!-- others -->
+[6 more terminal commands you should know]: https://betterprogramming.pub/6-more-terminal-commands-you-should-know-3606cecdf8b6
+[man page]: https://linux.die.net/man/1/cmp