Contents of marks.txt:
1) Amit Physics 80
2) Rahul Maths 90
3) Shyam Biology 87
4) Kedar English 85
5) Hari History 89
https://www.tutorialspoint.com/awk/awk_basic_examples.htm
columns or fields
$ awk '/Hari/ {print $0}' marks.txt
5) Hari History 89
