/Shell/Bash/Linux replace string in all files

Linux replace string in all files

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

How to replace a string in multiple files in linux command line

cd /path/to/your/folder
sed -i 's/foo/bar/g' *

Source: stackoverflow.com

Linux command line search and replace string in all files

 String Find and replace (folders/sub folders)
> grep -rl "old string" . | xargs sed -i 's/old string/new string/g'

 URL Find and replace  (folders/sub folders) 
> grep -rl "www\.google\.com" . | xargs sed -i 's/www\.google\.com/www\.yahoo\.com/g'

Source: php-quick-fix.blogspot.com

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