Find and replace text/characters in solaris/linux

Following command will search for files having name containing "hell" containing word  Hello and replace it with Hi.

# find and replace solaris

find ./* -name "hell*" -exec perl -pi -e 's/Hello/Hi/' {} \;

# find and replace in linux

 find ./* -name "hell*" -exec sed -i 's/Hello/Hi/' {} \;