How can I cut(1) camelcase words?

sed 's/\([A-Z]\)/ \1/g'

Captures each capital letter and substitutes a leading space with the capture for the whole stream.

$ echo "aCertainCamelCasedWord" | sed 's/\([A-Z]\)/ \1/g'
a Certain Camel Cased Word

This solution works if you need to not split up words that are all caps. For example, using the top answer you'll get:

$ echo 'FAQPage' | sed 's/\([A-Z]\)/ \1/g' 
F A Q Page

But instead with my solution, you'll get:

$ echo 'FAQPage' | sed 's/\([A-Z][^A-Z]\)/ \1/g'
FAQ Page

Note: This does not work correctly when there is a second instance of multiple uppercase words, for example:

$ echo 'FAQPageOneReplacedByFAQPageTwo' | sed 's|\([A-Z][^A-Z]\)| \1|g'
FAQ Page One Replaced ByFAQ Page Two

This answer does not work correctly when there is a second instance of multiple uppercase

echo 'FAQPageOneReplacedByFAQPageTwo' | sed 's|\([A-Z][^A-Z]\)| \1|g'
FAQ Page One Replaced ByFAQ Page Two

So and additional expression is required for that

 echo 'FAQPageOneReplacedByFAQPageTwo' | sed -e 's|\([A-Z][^A-Z]\)| \1|g' -e 's|\([a-z]\)\([A-Z]\)|\1 \2|g'
 FAQ Page One Replaced By FAQ Page Two

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