awk
root@DESKTOP-K1E4UTA:~# awk '{print $3 "\t" $4}' marks.txt
Physics 80
Maths 90
Biology 87
English 85
History 89
root@DESKTOP-K1E4UTA:~# awk '{print}' marks.txt
- Amit Physics 80
- Rahul Maths 90
- Shyam Biology 87
- Kedar English 85
- Hari History 89
root@DESKTOP-K1E4UTA:~# awk '/a/ {print $0}' marks.txt
2) Rahul Maths 90
3) Shyam Biology 87
4) Kedar English 85
5) Hari History 89
awk '/re 表达式/'
