Update cheatsheets

tldr/linux/zsync

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zsync
+
+> Partial/differential file downloader.
+> HTTPS is not supported - use HTTP URLs only.
+> See also: `rsync`.
+> More information: <https://manned.org/zsync>.
+
+- Download a file using a `.zsync` control file:
+
+`zsync {{path/to/url.zsync}}`
+
+- Use a local file as a seed to avoid re-downloading unchanged parts:
+
+`zsync -i {{path/to/existing_file}} {{path/to/url.zsync}}`
+
+- Save the updated file under a specific name:
+
+`zsync -i {{path/to/existing_file}} -o {{path/to/new_file}} {{path/to/url.zsync}}`
+
+- Resume a partial download and keep the temporary file:
+
+`zsync -k {{path/to/url.zsync}}`
+
+- Run in quiet mode with minimal output (no progress bar, download rate, or ETA display):
+
+`zsync -q {{path/to/url.zsync}}`