Update cheatsheets

ppmtobmp

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ppmtobmp
+
+> Convert a PPM image to a BMP file.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtobmp.html>.
+
+- Convert a PPM image to a BMP file:
+
+`ppmtobmp {{path/to/file.ppm}} > {{path/to/file.bmp}}`
+
+- Explicitly specify whether or not a Windows BMP file or an OS/2 BMP file should be created:
+
+`ppmtobmp -{{windows|os2}} {{path/to/file.ppm}} > {{path/to/file.bmp}}`
+
+- Use a specific number of bits for each pixel:
+
+`ppmtobmp -bbp {{1|4|8|24}} {{path/to/file.ppm}} > {{path/to/file.bmp}}`