Update cheatsheets

xxd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xxd
+
+> Create a hexadecimal representation (hexdump) from a binary file, or vice-versa.
+> More information: <https://manned.org/xxd>.
+
+- Generate a hexdump from a binary file and display the output:
+
+`xxd {{input_file}}`
+
+- Generate a hexdump from a binary file and save it as a text file:
+
+`xxd {{input_file}} {{output_file}}`
+
+- Display a more compact output, replacing consecutive zeros (if any) with a star:
+
+`xxd -a {{input_file}}`
+
+- Display the output with 10 columns of one octet (byte) each:
+
+`xxd -c {{10}} {{input_file}}`
+
+- Display output only up to a length of 32 bytes:
+
+`xxd -l {{32}} {{input_file}}`
+
+- Display the output in plain mode, without any gaps between the columns:
+
+`xxd -p {{input_file}}`
+
+- Revert a plaintext hexdump back into binary, and save it as a binary file:
+
+`xxd -r -p {{input_file}} {{output_file}}`