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 '!i{i=NF}{printf "%s ",$i;i--}'

EDIT: Since Ed has already exploited all the nice and proper awk solutions I'll throw in a native bash solution:

$ cat t.sh
#!/bin/bash

while read -ra numbers; do
        : ${i:=${#numbers[@]}}
        diag+=("${numbers[--i]}")
done < test.txt
echo "${diag[@]}"

.

$ ./t.sh
4 7 1 4