Raspberry Pi Zero has released out this week. It’s not powerful as Raspberry Pi 2. However specs is so good for 5$ computer.
Comparison with a playing card
For more information : https://www.raspberrypi.org/blog/raspberry-pi-zero/
grep -rl 'old-string' ./ | xargs sed -i 's/old-string/new-string/g'
This will search for the string ‘old-string’ in all files relative to the current directory and replace ‘old-string’ with ‘new-string’ for each occurrence of the string in each file.