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#!/bin/sh
set -e
if [ -z "$1" ]; then
echo "Usage: $0 <command>"
echo ""
echo "Run the given test expression for each newline-separated line in stdin, and echo only the lines that return zero."
echo "(Think filter in many programming languages)."
echo 'The iterator variable is called "$ELEM", and the index variable is called "$IDX".'
exit 1
fi
i=0
while IFS=$'\n' read -r line; do
j=0
for item in $line; do
eval "X${j}='$item'"
j=$((j+1))
done
set +e
IDX=$i ELEM="$line" eval "test $1"
if [ $? -eq 0 ]; then
echo "$line"
fi
set -e
i=$((i+1))
done
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