Bash printing diagonal of any size array

Question

So here I have the following code:

#!/bin/bash
awk \'BEGIN {f=4} {printf($f\" \"); f=f-1}\'

Which will take input such as:

Answer 1

$ awk '{print $(NF+1-NR)}' file    
4
7
1
4

$ awk -v ORS=" " '{print $(NF+1-NR)}' file
4 7 1 4 

or if you want to avoid adding a space to the end of your output line and to have a terminating newline:

$ awk '{printf "%s%s", (NR>1?FS:""), $(NF+1-NR)} END{print ""}' file
4 7 1 4