linux中的time()怎么实现的？

一、linux中的time()怎么实现的？

在linux中存在两个time，一个是bash的命令，另外一个是程序/usr/bin/time，bash的time命令只能很简单的显示程序执行的时间，而 /usr/bin/time程序可以显示很详细的与IO相关的数据，比如从内存中读取了多少数据，从磁盘中读取了多少数据之类的，以及文件系统的页大小。

通过type命令我们可以看到Linux中的两个time

linux">oracle@linux[]:~

$type -a time

time is a shell keyword

time is /usr/bin/time

bash中的time示例

oracle@linux[]:~

$time echo test

test

real

0m0。

000s

user

0m0。000s

sys

0m0。000s

bash中的time命令只能显示你程序的执行时间，包括实际执行时间，用户时间和系统时间，除此之外没有其他的信息。

而time程序就不一样了，它可以提供很详尽的信息，而且还能够定制time程序的输出结果，具体的可以通过man time查看，这里仅仅列举下time -v参数下的数据显示。

二、Recollections of Education in the 1970s and 1980s: A Time of Change and Progress

Introduction

Educational systems around the world underwent significant changes in the 1970s and 1980s. This period marked a shift in pedagogical approaches, curriculum innovation, and social reforms. Recollections of education during this transformative era provide deep insights into the challenges and progress made in shaping the minds of the future.

School Environment

The 1970s and 1980s saw a shift in the overall school environment. Schools were transitioning from traditional, authoritarian structures to more open and inclusive settings. The emphasis on discipline started to give way to a focus on holistic development. Teachers increasingly adopted a friendlier and more approachable demeanor, creating an environment conducive to learning and self-expression.

Curriculum Reform

During this period, there was a significant push for curriculum reform. The traditional rote-learning model began to be replaced by a more interactive and experiential approach. Science education saw a greater emphasis on practical experiments and real-world applications, while history and social sciences integrated diverse perspectives to provide a more comprehensive understanding of the past and present.

Role of Technology

The 1970s and 1980s witnessed the early integration of technology into education. While primitive by today's standards, tools such as slide projectors, filmstrips, and early computers made their way into classrooms. This technological integration laid the foundation for the digital revolution that would later redefine educational practices.

Social Reforms

Education in the 1970s and 1980s also reflected the societal changes happening at the time. Gender equality became a central theme, leading to changes in textbooks and educational policies. Additionally, a greater focus on diversity and inclusion started influencing the school environment, paving the way for a more tolerant and multicultural outlook.

Conclusion

Looking back at education in the 1970s and 1980s allows us to appreciate the profound transformation that took place. The shift towards a more inclusive, innovative, and technology-integrated educational system laid the groundwork for the modern methodologies and values we uphold today.

Thank you for taking the time to read about this crucial period in educational history. Understanding the developments of the past can provide valuable insights for shaping the future of education.

三、time.h在linux下能看吗？

能看，不同发行版的linux头文件所在目录不一样，可以使用find / -name time.h查找time.h文件，用vi或nano编辑器查看。

四、time time time time是什么歌？

歌名：Eenie Meenie

歌手：Sean Kingston / Justin Bieber

作词：肖恩·金斯顿

作曲：肖恩·金斯顿

《Eenie Meenie》是贾斯汀·比伯和肖恩·金斯顿合作的第一支单曲。

meenie meenie miney mo

小公鸡点到谁我就选谁

catch a bad chick by her toe

抓到一个坏女孩

if she holla'（if, if, if she holla） let her go

如果她求饶就放她走

shes indecisive

她犹豫不决

she can't decide

她做不了决定

she keeps on lookin'

她还在继续寻找

from left to right

从左看到右

girl, c'mon get closer

girl 来靠我近一点

look in my eyes

看着我的眼睛

searchin' is so wrong

不要再继续寻找

i'm mr. right

我就是你的Mr, right

you seem like the type

你看起来是那一种

to love em' and leave em'

敢爱敢恨

and disappear right after this song.

音乐结束就消失的女孩

so give me the night

所以今夜跟我在一起吧

to show you, hold you

让我给你看我的心 抱着你

don't leave me out here dancin' alone

别让我一个人孤单的跳舞

you can't make up your mind, mind, mind, mind, mind

你还是作不了决定

please don't waste my time, time, time, time, time

请不要浪费我的时间

i'm not tryin' to rewind, wind, wind, wind, wind

我不是试图绕圈子

i wish our hearts could come together as one

我多么希望我们的心能紧紧相拥

cause shorty is a eenie meenie miney mo lova'

因为女孩选男孩总是点点点

shorty is a eenie meenie miney mo lova'

点点点

shorty is a eenie meenie miney mo lova'

点点点

shorty is a eenie meenie miney mo lova'

点到谁就是谁

let me show you what your missin'

让我告诉你你错过了什么

paradise

天堂

with me you're winning girl

跟我在一起你就是赢家

you don't have to roll the dice

你不需要再摇骰子

tell me what you're really here for

告诉我你到底为了谁来这里

them other guys?

别的那些家伙？

i can see right through ya'

我一下就猜透了你的心思

you seem like the type

你看起来是那一种

to love em' and leave em'

敢爱敢恨

and disappear right after the song.

音乐结束就消失的女孩

so give me the night

所以今夜跟我在一起吧

to show you, hold you

让我给你看我的心 抱着你

don't leave me out here dancin' alone

别让我一个人孤单的跳舞

can't make up your mind

你还是作不了决定

please don't waste my time

请不要浪费我的时间

not tryin' to rewind

我不是试图绕圈子

i wish our hearts could come together as one

我多么希望我们的心能紧紧相拥

cause shorty is a eenie meenie miney mo lova'

因为女孩选男孩总是点点点

shorty is a eenie meenie miney mo lova'

点点点

shorty is a eenie meenie miney mo lova'

点点点

shorty is a eenie meenie miney mo lova'

点到谁就是谁

eenie meenie miney moe

小公鸡点到谁我就选谁

catch a bad chick by her toe

抓到一个坏女孩

if she holla'（if, if, if she holla） let her go

如果她求饶就放她走

eenie meenie miney moe

小公鸡点到谁我就选谁

catch a bad chick by her toe

抓到一个坏女孩

if she holla'（if, if, if she holla） let her go

如果她求饶就放她走

shorty is a eenie meenie miney mo lova'

女孩选男孩总是点点点

shorty is a eenie meenie miney mo lova'

点点点

shorty is a eenie meenie miney mo lova'

点点点

shorty is a eenie meenie miney mo lova'

点到谁就是谁

can't make up your mind

你还是作不了决定

please don't waste my time

请不要浪费我的时间

not tryin' to rewind

我不是试图绕圈子

i wish our hearts could come together as one

我希望我们的心能紧紧相拥

五、at the time at that time与at a time区别？

at the time中文意思是“在这个时候”。

例如，我们山上的茶花每年都在这个时候绽放。

The camellias on our mountain bloom at the time of year.

at that time中文意思是“在那个时候”，常用过去进行时。

昨天晚上那个时候我在电影院看电影。

I was watching a movie at the cinema at that time last night.

at a time中文意思是“每次”

例如，你每天每次服三片药丸。

You take three pills at a time a day.

六、by the time，at the time，at that time的区别？

at the time 在……的时候

by the time 在一个时间点之前

1______2______3

1是过去的一个时间点,

2是现在的一个时间点,

3是将来的一个时间点.

at the time可以是1,2,3

by the time可以是1~2,3

七、it is the time to和it is time to？

It is time to go to school now.

It is time to study Chinese.

It is time to go to work now.

It is time to get up now.

It is time to go to have a meeting now.

It is time to practice writing.

It is time to leave her.

It is time to sleep now.

It is time to read English book now.

八、on time和at time区别？

at time为有时，in time为及时，on time准时，都是形容词。On time一般用在句子后或最后两个字，其用词是当一件事准时发生，强调事情是按计划而发生的，而In time的英文句子结构是in time＋动词或某些情况，at time作时间状语，一般放在句末。

on time用法

on time的英文意思是“happening or done at the particular moment that it was expected to happen or be done”，即“按时，准时”。其通常用来描述和计划相关的内容，比如天气不好，但是和别人约在了下午一点见面，你按时到达了，这个按时就可以用“on time”来表示。当想表达自己没有迟到，在这样的语境中，on time更加强调“在具体时间内没有迟到”。

例句如下：

The bus came righton time.

公共汽车正好准时到达。

in time用法

in time的英文意思是“early enough”，即“及时，迟早”。 也就是指正赶上时候或恰在需要的时候，其通常更加强调的是动作在时间内完成或者提前完成某事。当想表达自己没有迟到，在这样的语境中，in time和on time可以互换，不过in time更加强调的是“没有迟到”。

例句：

We managed to get to the airportin time.

我们设法及时赶到了机场。

九、by the time和by the time of区别？

一、by the time的中文意思及用法介绍

by the time意为到…的时候。可以表示将来的时间，其主句用将来完成时，从句用一般现在时来表示将来的动作；也可表示过去的时间，其主句用过去完成时，从句用一般过去时。

例句：By the time you get there the meeting will be over.

等你到了那里的时候，会议就该结束了。

By the time I arrived on the scene, it was all over.

我来到现场时，一切都已结束。

She was tired and out of sorts by the time she arrived home.

她回到家里，又累又烦。

By the time we arrived, someone had grabbed all the good seats.

我们到达时，所有的好位子都给人占了。

By the time he'd fixed the leak, I was into him for$ 500.

他补好漏洞时，我就该付给他500元。

By the time I get home, I'm too tired to do anything active

我到家时累得无法动弹。

By the time we had made landfall the boat looked ten years older!

等到我们登陆时，这艘船看似已老了10年！

二、by the end of的中文意思及用法介绍

by the end of意为在…尽头。多指时间,常用于完成时态,也用于将来时态。

例句：The way things are going the company will be bankrupt by the end of the year.

从事态发展的情况看，到年底公司就得破产。

I'm always broke by the end of the month.

我总是一到月底就没钱花了。

Please bring back all library books by the end of the week.

请在周末前把图书馆的书全部归还。

They're aiming at training everybody by the end of the year.

他们力求做到在年底前人人得到培训。

Make sure your claims for expenses are submitted by the end of the month.

你的费用一定要在月底以前办理报销。

十、in time和in no time区别？

at no time 与 in no time区别为：词义不同、侧重点不同、用法不同。

一、词义不同

1、at no time：at no time词义是绝不，从来没有，从不。

2、in no time：in no time词义是马上，立即，立刻。

二、侧重点不同

1、at no time：at no time侧重于否定。

2、in no time：in no time侧重于时间上速度快。

三、用法不同

1、at no time：位于句首时要倒装：At no time should you give up studying. 任何时候你都不应该放弃学习。

2、in no time：位于尾首：He predicted that my hair would grow back 'in no time' 他预言我的头发“一眨眼”就会长回来。