Update cheatsheets

macptopbm

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# macptopbm
+
+> Read a MacPaint file as input and produce a PBM image as output.
+> See also: `pbmtomacp`.
+> More information: <https://netpbm.sourceforge.net/doc/macptopbm.html>.
+
+- Convert a MacPaint file into a PGM image:
+
+`macptopbm {{path/to/file.macp}} > {{path/to/output.pbm}}`
+
+- Skip over a specified number of bytes when reading the file:
+
+`macptopbm -extraskip {{N}} > {{path/to/output.pbm}}`
+
+- Suppress all informational messages:
+
+`macptopbm -quiet > {{path/to/output.pbm}}`
+
+- Display version:
+
+`macptopbm -version`