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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' {} ;