Linux command line global search and replace

[filename]:[line number]:[text]

perl -p -i -e 's/oldstring/newstring/g' `grep -ril searchpattern *`

sed -i 's/foo/bar/g' *

find -name '*.html' -print -exec sed -i.bak 's/foo/bar/g' {} ;

for i in *; do
  sed -i 's/foo/bar/' $i
done

ruby -i.bak -pe 'sub(%r{foo}, 'bar')' *
perl -pi.bak -e 's/foo/bar/' *

find -name '*.htm?' -print -exec sed -i.bak 's/foo/bar/g' {} ;