# Calculating series with awk: add numbers from 1 to 100

seq 100 | awk '{sum+=\$1} END {print sum}'
"seq 100" outputs 1,2,..,100, separated by newlines. awk adds them up and displays the sum. "seq 1 2 11" outputs 1,3,..,11. Variations: 1+3+...+(2n-1) = n^2 `seq 1 2 19 | awk '{sum+=\$1} END {print sum}' # displays 100` 1/2 + 1/4 + ... = 1 `seq 10 | awk '{sum+=1/(2**\$1)} END {print sum}' # displays 0.999023`
Sample Output
`5050`

4
2009-03-24 20:30:40

## 1 Alternatives + Submit Alt

• Calculating series with awk only, no need for seq: add numbers from 1 to 100 Variations: 1+3+...+(2n-1) = n^2 `awk 'BEGIN {for(i=1;i<=19;i+=2)sum+=i}; END {print sum}' /dev/null # displays 100` 1/2 + 1/4 + ... = 1 `awk 'BEGIN {for(i=1;i<=10;i++)sum+=1/(2**i)}; END {print sum}' /dev/null # displays 0.999023` Show Sample Output

0
awk 'BEGIN {for(i=1;i<=100;i++)sum+=i}; END {print sum}' /dev/null
· 2009-10-26 18:24:57

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Perfecthomepugs · 98 weeks ago
pugpuppies95 · 60 weeks ago

### What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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