Update cheatsheets

linux/zbarcam

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zbarcam
+
+> Scan and decode barcodes (and QR codes) from a video device.
+> More information: <https://manned.org/zbarcam>.
+
+- Continuously read barcodes and print them to `stdout`:
+
+`zbarcam`
+
+- Disable output video window while scanning:
+
+`zbarcam --nodisplay`
+
+- Print barcodes without type information:
+
+`zbarcam --raw`
+
+- Define capture device:
+
+`zbarcam /dev/{{video_device}}`