Update cheatsheets

cupstestppd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cupstestppd
+
+> Test conformance of PPD files to the version 4.3 of the specification.
+> Error codes (1, 2, 3 and 4, respectively): bad CLI arguments, unable to open file, unskippable format errors and non-conformance with PPD specification.
+> Note: this command is deprecated.
+> See also: `lpadmin`.
+> More information: <https://openprinting.github.io/cups/doc/man-cupstestppd.html>.
+
+- Test the conformance of one or more files in quiet mode:
+
+`cupstestppd -q {{path/to/file1.ppd path/to/file2.ppd ...}}`
+
+- Get the PPD file from `stdin`, showing detailed conformance testing results:
+
+`cupstestppd -v - < {{path/to/file.ppd}}`
+
+- Test all PPD files under the current directory, printing the names of each file that does not conform:
+
+`find . -name \*.ppd \! -execdir cupstestppd -q '{}' \; -print`