Shell Programming and Scripting

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#!/bin/bash
while read line; do
a=($line)
last=$((${#a[*]}-1))
sum=${a[0]}
echo -n "$sum "
for i in $(seq 1 $last); do         <-- this line does not work!
sum=$((sum+${a[$i]}))
echo -n "+ ${a[$i]} "
done
echo "= $sum"
done < input.txt

awk '{for(i=1;i<=NF;i++){NUM=NUM?NUM+$i:$i};$(NF+1)=NUM;NUM=""} 1'   Input_file

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#!/bin/bash
while read line; do
a=($line)
sum=0
for i in "${a[@]}"; do
sum=$((sum+$i))
done
echo "= $sum"
done <input.txt

awk '{sum=0; for(i=1; i<=NF; i++) sum += $i; print sum}'

perl -Mstrict -MList::Util=sum -wanE 'say sum(@F)'

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<blank line or character>
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8

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26

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4
<blank line or character>
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8