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#!/bin/sh
set -e
usage() {
echo "Usage: ${0##*/} [-l length] [chars]" >&2
exit 1
}
while getopts 'l:' o; do
case "$o" in
l) len="$OPTARG" ;;
*) usage ;;
esac
done
shift $((OPTIND - 1))
[ $# -gt 1 ] && usage
</dev/urandom tr -dc -- "${1:-[:graph:]}" | head -c "${len:-64}"
echo
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