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I'm looking for a command or bash script that will create an index.html file in every directory and subdirectory starting at the current directory. I would like it to prompt to overwrite so I don't delete a good index.html file.

$ export INDEXFILE=/path/to/index/file/index.html
$ find . -type d -exec cp -i ${INDEXFILE} '{}' \;

That copies ${INDEXFILE} interactively to every directory found below the execution point.

N.B. Not tested.

This doesn't prompt to overwrite; it does nothing in directories already containing index.html:

find . -type d | while read dir
    cd "$dir" &&
     [ -s "$ndx" ] || mkindex > "$ndx" ## where mkindex is a script to create index file
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