Find and Replace text strings recursively through all files and sub-folders of a particular directory.
Run the following command from SSH terminal:
egrep -lRZ 'old-text-string' . | xargs -0 -l sed -i -e 's/old-text-string/new-text-string/g'
This command will recursively replace every instance of "old-text-string" with "new-text-string. Modify the command to best meet your needs.