#!/bin/sh

if [ "$1" = "-h" ]; then
	cat <<EOF>&2
Usage: ${0##*/} PATH

Display PATH one entry per line. If PATH is not provided, use \$PATH by default.

EOF
	exit
fi

if [ $# -ne 0 ]; then
	ARG="$1"
else
	ARG="$PATH"
fi

case "$ARG" in
*:*)  SEP=':';;
*\;*) SEP=';';;
*/*)  SEP='/';;
*,*)  SEP=',';;
*\|*) SEP='|';;
*)    SEP=':';;
esac

echo "$ARG" |  awk -v RS=$SEP '1'