Update cheatsheets

ppmpat

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ppmpat
+
+> Produce a PPM image with a pattern.
+> More information: <https://netpbm.sourceforge.net/doc/ppmpat.html>.
+
+- Produce a PPM file of the specified pattern with the specified dimensions:
+
+`ppmpat -{{gingham2|gingham3|madras|tartan|poles|...}} {{width}} {{height}} > {{path/to/file.ppm}}`
+
+- Produce a PPM file of a camo pattern using the specified colors:
+
+`ppmpat -camo -color {{color1,color2,...}} {{width}} {{height}} > {{path/to/file.ppm}}`