Bash:计算脚本运行需要多长时间

Question

有没有办法让 bash 脚本打印运行时间？

一些相当简单的东西，比如:

#!/bin/bash
something to start time
command to be run
something to calculate runtime and print result

Answer 1

有标准工具time .

脚本:

#!/bin/bash

echo start
sleep 2
echo end

用法:

$ time ./so.sh       
start
end
./so.sh  0.00s user 0.01s system 0% cpu 2.007 total