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#!/bin/sh
if [ "$#" -ne 2 ]; then
echo "Usage: $0 <init> <expr>"
echo ""
echo "Run the given command for each newline-separated line in stdin."
echo 'The expression computes the next value of "$ACC" (think reduce in many programming languages).'
echo 'The initial value of "$ACC" is the first argument to the script.'
echo 'The iterator variable is called "$ELEM", and the index variable is called "$IDX".'
echo 'The final value of "$ACC" is printed after all lines have been processed.'
exit 1
fi
i=0
ACC="$1"
while IFS=$'\n' read -r line; do
j=0
for item in $line; do
eval "X${j}='$item'"
j=$((j+1))
done
IDX=$i ELEM="$line" eval "ACC=\"$2\""
i=$((i+1))
done
echo "$ACC"
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