linux find replace in all files code example

Example 1: ubuntu command line replace word in files

sed -i 's/original/new/g' file.txt

Example 2: linux replace string in all files

sed -i 's/old-text/new-text/g' input.txt

Example 3: find and replace in all files in directory centos

grep -rl 'apples' /dir_to_search_under | xargs sed -i 's/apples/oranges/g'