Spoken Tutorial, IIT Bombay 
	        https://spoken-tutorial.org 

	         Sed - Stream Editor       
	 Sed Substitute command - Assignment

Try the below commands and see the output.

1. sed 's/[0-9.]*/(*)/' message.txt
2. sed '/secrets/s/success/victory/g' message.txt
3. sed 's/-/:/' message.txt