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document sum
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sh/sum
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sh/sum
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@ -4,6 +4,15 @@
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# YES_DASH
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sum() { ### @-
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### compute the summation of its arguments without forking processes.
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### this relies on the shell's built-in arithmetic operators.
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###
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### ```
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### $ sum 1 2 3
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### 6
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### ```
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###
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### **TODO:** consider renaming because sum(1) already exists.
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local sum=0
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for i; do
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: $((sum+=i))
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