sed command with -i option failing on Mac, but works on Linux

Question

I\'ve successfully used the following sed command to search/replace text in Linux:

sed -i \'s/old_link/new_link/g\' *

However,

Answer 1

This works with both GNU and BSD versions of sed:

sed -i'' -e 's/old_link/new_link/g' *

or with backup:

sed -i'.bak' -e 's/old_link/new_link/g' *

Note missing space after -i option! (Necessary for GNU sed)