#358 Remove blank lines using awk

Remove blank lines using awk.

NF variable in awk holds the number of fields in the line. In case of empty line, NF is zero and the condition is not met, so awk does nothing.

example.txt

1

2

3

4

5

6

7

8

9

ex358.txt

awk 'NF' example.txt

output:

1
2
3
4
5
6
7
8
9