# Simple CSV manipulation

# Effect of running `&fras "example.csv"`
$ C1,C2,C3,C4,C5
$ 1,5,9,13,17
$ 2,6,10,14,18
$ 3,7,11,15,19
$ 4,8,12,16,20

&p⍜°csv(⍜⍉˜⊂⊂□"SUM"≡(□⍜⋕/+)⊸↘1)
# Save using `&fwa "example.csv"`