Linux : Replace string in multiple files recursively

Hi,

If you want to search and replace specific string from multiple file recursively then below command is useful  for it :

Linux Command:
# grep -rl "string1" * -R | xargs sed -i 's/string1/string2/g'


Here above command is combination of  'grep' and 'sed', 
grep : Command will search for "string1" and returns file-name where string1 found

sed : will replace the "string1" to "string2"

string1 : old string
string2 : New string

You can watch the above process on youtube also...

http://youtu.be/GcopukZz3io