grep -lr --include=config "@rtcamp.com" . | xargs sed -i -e 's/@rtcamp.com/@ac.rtcamp.com/g'
find /tmp -name "*.tmp" -print0 | xargs -0 rm
Read more: https://javarevisited.blogspot.com/2012/06/10-xargs-command-example-in-linux-unix.html#ixzz7eNsltauy