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What is the awk command(s) to calculate the sum of all digits in the input? For example, if the input contains the number 123 in
What is the awk command(s) to calculate the sum of all digits in the input?
For example, if the input contains the number 123 in the first line, and the number 456 in the last line, the output should be 21. The output should be a single number.
Please provide a series of comments that fully describes your awk commands, including a description of the purpose of each function call, and the arguments to each function.
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