bash 如何从“时间”命令中获取实时值？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/3795470/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I get just real time value from 'time' command?
提问by Matthew Sowders
I would like to make a script that outputs only the real time value from the time command so I can plot the results. For example time commandoutputs
我想制作一个脚本，只输出 time 命令的实时值，以便我可以绘制结果。例如time command输出
real 1m0.001s
user 1m0.000s
sys 0m0.001s
I want to write a script that outputs
我想写一个输出的脚本
60.001
How do I get just real time value from 'time' command in seconds?
如何以秒为单位从“时间”命令中获取实时值？
回答by Paused until further notice.
If you're using the Bash builtin time, set the TIMEFORMATvariable to %R:
如果您使用的是 Bash 内置time，请将TIMEFORMAT变量设置为%R：
$ TIMEFORMAT=%R
$ time sleep 1
1.022
回答by eumiro
timecan take an optional --formator -fparameter, but you have to use the full path to the time command, /usr/bin/time
time可以采用可选--format或-f参数，但您必须使用时间命令的完整路径，/usr/bin/time
/usr/bin/time -f "%e" sleep 3
3.00
Without the path, it'll use the timecommand of the shellwhich just treats all arguments as the command, so you'll get an -f: command not found.
如果没有路径，它将使用timeshell的命令，该命令仅将所有参数视为命令，因此您将获得一个-f: command not found.
回答by Martin T.
If you write \timeyou enforce not to use the bash built in time.
So with \time -f '%e' commandyou are done.
如果你写\time你强制不使用内置的 bash 时间。这样\time -f '%e' command你就完成了。
回答by Archimedix
Alternatively, use /usr/bin/timeor take a look at the similar question
Using time command in bash script.
或者，使用/usr/bin/time或查看类似问题
Using time command in bash script。
