find grep with xargs
find . -name '*-items.xml' | xargs grep -i '=cmscomponent'
tar split into parts
tar cfvz - MyBigFolder/ | split -b 20m - MyBigFolder.tar.gz.
Splits the content into parts with each with a max size of 20MB. The parts getting a suffix attached to the name. To untar them again use
cat MyBigFolder.tar.gz.* | tar xfvz -