s=0
for (( i=1;i<=100;i=i+1 ))
do
s=$(($s+$i))
done
echo "1+2+3+......+100 ==>$s"
#!/bin/sh
sum=0
for ((i=0;i<=100;i++))
do
sum=$((sum+i))
done
echo sum=$sum
#!/usr/bin/perl
$counter += $_ for 1..100;
print $counter;
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