Update cheatsheets

pcxtoppm

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pcxtoppm
+
+> Convert a PCX file to a PPM image.
+> More information: <https://netpbm.sourceforge.net/doc/pcxtoppm.html>.
+
+- Convert a PCX file to a PPM image:
+
+`pcxtoppm {{path/to/file.pcx}} > {{path/to/file.ppm}}`
+
+- Use a predefined standard palette even if the PCX file provides one:
+
+`pcxtoppm -stdpalette {{path/to/file.pcx}} > {{path/to/file.ppm}}`
+
+- Print information on the PCX header to `stdout`:
+
+`pcxtoppm -verbose {{path/to/file.pcx}} > {{path/to/file.ppm}}`