Use functional function
In this example we will see how to use functional function.
If your input looks like
1
5
7
-6
You can use jawk
like:
jawk \
-o csv \
--select '.=number' \
--select '(fold (.range) 1 (* (+ 1 .index) .so_far))=factorial'
To produce:
"number", "factorial"
1, 1
5, 120
7, 5040
-6,