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#!/usr/bin/env bash
curr=$(date '+%s%N')
etime=${curr:0:${#curr}-6}
if [[ $# -eq 0 ]];then
echo $etime
else
[ "$1" == "-h" -o "$1" == "--help" ] && \
echo "usage: $0 [start_ms]" && \
echo " if no start_ms is given, return the currentime" && \
echo " if start_ms is given, return the difference" && exit 0
stime=$1
[[ -z "$stime" ]] && stime=$etime
echo $((etime - stime))
fi
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