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Another way with awk:
$ awk '{print s+=$1}' file
2
6
13
10
15
13
[ad_2]
solved Output subtotal at each line while adding up numbers, one per line
[ad_1]
Another way with awk:
$ awk '{print s+=$1}' file
2
6
13
10
15
13
[ad_2]
solved Output subtotal at each line while adding up numbers, one per line