22 lines
428 B
Bash
22 lines
428 B
Bash
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#!/bin/bash
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#=============== function
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function add
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{
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... # the cmd line inspired by sequence 3
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}
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#=============== main
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if .... ; then. # number of args is greater than 0
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for item
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do
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if .... # item is a file ?
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then
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... # error message
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.... # stop the script with exit status to 1
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fi
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done
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sum=... #call add function
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else
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sum=... #call add function and use stdin
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fi
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echo "sum = $sum"
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exit 0
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