gawi

Hi! I need your help.

1)
How to make a script which writes its argument in the other way round. I mean if arguments are "2 3 4 5" the script writes "5 4 3 2"

2)
How to make a script which reads a file which consinst of numbers (one number in one line) and writes the sum of those numbers.

E.G. the content of file:
------
3
7
6
4
------

in this case the script should write: 20

Please help me