Update cheatsheets

mmv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mmv
+
+> Move and rename files in bulk.
+> More information: <https://manned.org/mmv.1>.
+
+- Rename all files with a certain extension to a different extension:
+
+`mmv "*{{.old_extension}}" "#1{{.new_extension}}"`
+
+- Copy `report6part4.txt` to `./french/rapport6partie4.txt` along with all similarly named files:
+
+`mmv -c "{{report*part*.txt}}" "{{./french/rapport#1partie#2.txt}}"`
+
+- Append all `.txt` files into one file:
+
+`mmv -a "{{*.txt}}" "{{all.txt}}"`
+
+- Convert dates in filenames from "M-D-Y" format to "D-M-Y" format:
+
+`mmv "{{[0-1][0-9]-[0-3][0-9]-[0-9][0-9][0-9][0-9].txt}}" "{{#3#4-#1#2-#5#6#7#8.txt}}"`