style-guide: add guidelines for standard streams; fix remaining pages (#11196)
* readonly, {un,}compress, zbarcam: use proper syntax for IO streams * style-guide: add guidelines for standard streams * duckdb, perl: add backticks around stdin and stdout
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# zbarcam
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> Scans and decodes barcodes (and QR codes) from a video device.
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> Scan and decode barcodes (and QR codes) from a video device.
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> More information: <https://manned.org/zbarcam>.
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- Continuously read barcodes and print them to standard output:
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- Continuously read barcodes and print them to `stdout`:
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`zbarcam`
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