获取程序的执行时间在外壳

本文介绍了获取程序的执行时间在外壳的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想了几个不同的条件下执行在Linux Shell中的东西，并且能够输出每个执行的执行时间。

I want to execute something in a linux shell under a few different conditions, and be able to output the execution time of each execution.

我知道我可以写一个Perl或Python脚本，将做到这一点，但有一个方法可以让我做的壳呢？ （这恰好是bash）的

I know I could write a perl or python script that would do this, but is there a way I can do it in the shell? (which happens to be bash)

推荐答案

使用内建的时间命令：

$ help time time: time [-p] PIPELINE Execute PIPELINE and print a summary of the real time, user CPU time, and system CPU time spent executing PIPELINE when it terminates. The return status is the return status of PIPELINE. The `-p' option prints the timing summary in a slightly different format. This uses the value of the TIMEFORMAT variable as the output format. times: times Print the accumulated user and system times for processes run from the shell.

例如：

$ time sleep 2

real 0m2.009s user 0m0.000s sys 0m0.004s