Abhinay1997/awk_notes.md

## awk_notes.md

      
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              awk_notes.md
            
          
    AWK Notes

WK is an interpreted programming language. It is very powerful and specially designed for text processing. Its name is derived from the family names of its authors − Alfred Aho, Peter Weinberger, and Brian Kernighan.
The version of AWK that GNU/Linux distributes is written and maintained by the Free Software Foundation (FSF); it is often referred to as GNU AWK.
This version is also known as GAWK. This is what is available through git bash for windows.
Awk Basics


 awk 'BEGIN{printf "Number of lines with THIS "} /This/ {++cnt} END{print cnt}' test.txt


Command line

#Can be used either directly by typing commands on the shell or by specfiying file containing awk commands (.awk extension).
#Directly
$awk '{print}' marks.txt
#Prints all lines in marks.txt
1) Amit     Physics    80
2) Rahul    Maths      90
3) Shyam    Biology    87
4) Kedar    English    85
5) Hari     History    89
#Alternately
$awk -f commands.awk marks.txt
#Where commands.awk contains only {print}
1) Amit     Physics    80
2) Rahul    Maths      90
3) Shyam    Biology    87
4) Kedar    English    85
5) Hari     History    89