please help!!!!!!
I have a file .txt that has only one column like that:
34.1
35.5
35.6
45.6
...
Now, i want to add a column in the left in which the values of this column increase by 0.4 , for example:
0.0 34.1
0.4 35.5
0.8 35.6
1.2 45.6
How can i do with awk instructions???
Many thanks!!!!!!!!