22 lines
309 B
Bash
22 lines
309 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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echo $(cat $@) | tr ' ' '+' | bc
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}
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#=============== main
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if [ $# -gt 0 ] ; then
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for item
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do
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if [ ! -f $item ]
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then
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echo "ERROR: $file doesn't exist" >&2
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exit 1
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fi
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done
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sum=$(add "$@")
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else
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sum=$(add - )
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fi
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echo "sum = $sum"
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exit 0
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