More safer solution from Stack Overflow answer:
find ./posts -name '*.md' -print0 \ | sed -z 'p;s/md$/mdx/' \ | xargs -0rn2 mv --
Use -print0 is necessary for processing file names with newlines.
-print0
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More safer solution from Stack Overflow answer:
Use
-print0
is necessary for processing file names with newlines.