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#!/usr/bin/env bash
# echo and eval
a=
while getopts a OPT; do
case "$OPT" in
a)
# Append to file instead of overwriting.
a=-a
;;
?)
exit 2
;;
esac
done
shift "$(($OPTIND - 1))"
cmd="$1"
outfile="${2:-/dev/null}"
echo "$cmd" | tee $a "$outfile"
eval "$cmd"
exit "$?"