tldr/pages/common/mmv.md

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# mmv
> Move and rename files in bulk.
- 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:
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`mmv -c "{{report*part*.txt}}" "{{./french/rapport#1partie#2.txt}}"`
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- Append all `.txt` files into one file:
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`mmv -a "{{*.txt}}" "{{all.txt}}"`
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- 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}}"`