bash脚本写在一个文件执行时间 [英] bash script write executing time in a file

问题描述

我需要写在一个txt文件来执行这个命令的时间：

I need to write the time taken to execute this command in a txt file:

time ./program.exe

我

如何在bash脚本呢？

How can I do in bash script?

我尝试用＆GT;＆GT; TIME.TXT 但是，这并不正常工作（输出不会去文件并执行到屏幕）。

I try with >> time.txt but that doesn't work (the output does not go to file and does go to the screen).

推荐答案

获得时间在庆典写文件是艰苦的工作。这是一个庆典内置命令。 （在Mac OS X中，有一个外部命令，的/ usr / bin / time会，也做了类似的工作，但使用不同的输出格式和更少的顽抗。）

Getting time in bash to write to a file is hard work. It is a bash built-in command. (On Mac OS X, there's an external command, /usr/bin/time, that does a similar job but with a different output format and less recalcitrance.)

您需要使用：

(time ./program.exe) 2> time.txt

它写入标准错误（因此 2 - ; 符号）。但是，如果你不使用子shell（括号），这是行不通的;输出还是对屏幕。

It writes to standard error (hence the 2> notation). However, if you don't use the sub-shell (the parentheses), it doesn't work; the output still comes to the screen.

此外，没有一个子shell，你可以使用：

Alternatively, and without a sub-shell, you can use:

{ time ./program.exe; } 2> time.txt

请注意开括号和分号后面的空格;两者都需要在一行。大括号必须出现在那里的命令可能出现，并且必须是独立的符号。 （如果你努力奋斗的话，你会想出 ...;} |东西或 ...;} 2 - ;＆放大器; 1 这两个标识支架作为一个独立的象征，但如果你尝试 ...;} XYZ ，外壳（可能）无法找到一个名为} XYZ 命令，虽然。）

Note the space after the open brace and the semi-colon; both are necessary on a single line. The braces must appear where a command could appear, and must be standalone symbols. (If you struggle hard enough, you'll come up with ...;}|something or ...;}2>&1. Both of these identify the brace as a standalone symbol, though. If you try ...;}xyz, the shell will (probably) fail to find a command called }xyz, though.)

我需要在更多的终端上运行更多的命令。如果我这样做：

I need to run more command in more terminal. If I do this:

 xterm -xrm '*hold: true' -e (time ./Program.exe) >> time.exe & sleep 2

  
  

这是行不通的，并告诉我语法错误：？（意外如何解决这个问题。

您需要做的是这样的：

xterm -xrm '*hold: true' -e sh -c "(time ./Program.exe) 2> time.txt & sleep 2"

关键变化是运行的脚本从参数到 -c 选项来的壳;您可以替换 SH 与 /斌/庆典或等效的名称。这应该让周围的任何语法错误的问题。我不太清楚是什么原因引发的错误，虽然如此，有可能是对付它更简单，更好的方法。这也是可以想象，的xterm 的 -e 选项只需要一个字符串参数，在这种情况下，我想你'D使用：

The key change is to run the shell with the script coming from the argument to the -c option; you can replace sh with /bin/bash or an equivalent name. That should get around any 'Syntax error' issues. I'm not quite sure what triggers that error, though, so there may be a simpler and better way to deal with it. It's also conceivable that xterm's -e option only takes a single string argument, in which case, I suppose you'd use:

xterm -xrm '*hold: true' -e 'sh -c "(time ./Program.exe) 2> time.txt & sleep 2"'

您可以手动庆典的xterm 以及我可以。

You can manual bash xterm as well as I can.

我不知道为什么你在后台运行模式，定时程序，但是这是你的问题，不是我的。同样，睡眠2 显然不是必要的，如果搁置：真正的保持终端打开

I'm not sure why you run the timed program in background mode, but that's your problem, not mine. Similarly, the sleep 2 is not obviously necessary if the hold: true keeps the terminal open.

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