Update cheatsheets

linux/rpicam-still

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rpicam-still
+
+> Capture and store a photo using a Raspberry Pi camera with legacy features missing from `rpicam-jpeg`.
+> More information: <https://www.raspberrypi.com/documentation/computers/camera_software.html#rpicam-still>.
+
+- Capture a photo with different encoding:
+
+`rpicam-still -e {{bmp|png|rgb|yuv420}} -o {{path/to/file.{{bmp|png|rgb|yuv420}}}}`
+
+- Capture a raw image:
+
+`rpicam-still -r -o {{path/to/file.jpg}}`
+
+- Capture a 100 second exposure image:
+
+`rpicam-still -o {{path/to/file.jpg}} --shutter 100000`