20 awkで合計

$ cat a
1
2
3
4
5

$ cat a | awk '{s+=$1} END {print s}'
15

$ cat a
1 2
2 3
3 5
4 8
5 10

$ cat a| awk '{s1+=$1} {s2+=$2} END {print s1" "s2}'
15 28