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