Awk from entry to burial (1) awk first meeting

Let's give you one first awk A simple example of , Let's get to know awk The basic structure of the command .

1、 First experience

Let's create a name marks.txt The file of . Including serial number 、 Student name 、 Course name and grades .

1)    Amit     Physics    80
2)    Rahul    Maths      90
3)    Shyam    Biology    87
4)    Kedar    English    85
5)    Hari     History    89

Next , We will use AWK Script to display the contents of the output file , At the same time, output header information .

[jerry]$ awk 'BEGIN{printf "Sr No\tName\tSub\tMarks\n"} {print} END{printf "----------------------------\n"}' marks.txt

After executing the above code , The following results will be output ：

Sr No	Name	Sub	Marks
1)    Amit     Physics    80
2)    Rahul    Maths      90
3)    Shyam    Biology    87
4)    Kedar    English    85
5)    Hari     History    89
----------------------------

Output multiple headers and split lines , Besides, it looks no different from the content of the source file . But this statement describes awk The basic structure of grammar , Let's introduce .

awk 'BEGIN{printf "Sr No\tName\tSub\tMarks\n"} {print} END{printf "---------------