Getting started with awk.

$ awk 'BEGIN { print 42 }'
42

$ awk 'BEGIN { print "Hello World" }'
Hello World    

Okay - a nice start.

Bah, lemme push it a bit....

$ awk ''
$ awk 'BEGIN {}'
$ awk 'BEGIN { print;}'

$ awk 'BEGIN { print}'

$ awk 'BEGIN { print "Hello"}'
Hello
$ awk 'BEGIN { print "Hello" + 42}'
42
$ awk 'BEGIN { print "Hello"42}'
Hello42
$ awk 'BEGIN { print "Hello" 42}'
Hello42
$ awk 'BEGIN { print "Hello" 42 "Hello"}'
Hello42Hello
$ awk 'BEGIN { print; print ;print}'

(3 empty lines).

Ok, ready to move on now.

In the following examples i'll be working with a file, called data.txt, that contains:

Beth    4.00    0
Dan     3.75    0
Kathy   4.00    10
Mark    5.00    20
Mary    5.50    22
Susie   4.25    18

...where there is a tab character between each field.

From there, we can pipe the input to awk...

~$ cat data.txt | awk '{print $1}'
Beth
Dan
Kathy
Mark
Mary
Susie    

Or can have awk load the file, for example:

$ awk '{print $1}' data.txt
Beth
Dan
Kathy
Mark
Mary
Susie

References

* [A Scripter's Notes: awk](https://scripter.co/notes/awk)

results matching ""

    No results matching ""