I want to create a new column record header
My current input file is -
I want my output file to have such headers where date is added my one-
| Age | 2019-11-12 | 2019-11-13 |
| 1 | 15$ | *empty to add the input from another file |
| 2 | 89$ | *empty |
How do i automate this column creation task?
Steve