exchange two words using sed in Linux

Question

guys! I am trying to exchange two words in a line but it doesn\'t work. For example: \"Today is my first day of university\" should be \"my is Today first day of university\"

Answer 1

Try this:

sed -rn 's/(\w+\s)(\w+\s)(\w+\s)(.*)/\3\2\1\4/p' filename.txt

-n suppress automatic printing of pattern space

-r use extended regular expressions in the script

\s for whitespace