bash Linux终端输出重定向
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Linux terminal output redirection
提问by Jon Ericson
I want to redirect the output of a bash script to a file.
我想将 bash 脚本的输出重定向到一个文件。
The script is:
脚本是：
#!/bin/bash
echo "recursive c"
for ((i=0;i<=20;i+=1)); do
time ./recursive
done
But if I run it like this:
但是如果我像这样运行它：
script.sh >> temp.txt
only the output of ./recursive will be captured in the file.
只有 ./recursive 的输出会被捕获到文件中。
I want to capture the output of time command in the file.
我想在文件中捕获 time 命令的输出。
回答by Jon Ericson
Redirect STDERRto STDOUT:
重定向STDERR到STDOUT：
script.sh >> temp.txt 2>&1
Or if using bash4.0:
或者如果使用bash4.0：
$ script.sh &>> temp.txt
(Thanks for the second form go to commenter ephemient. I can't verify as I have an earlier bash.)
（感谢第二个表格转到评论者 ephemient。我无法验证，因为我有一个更早的bash.）
My tests were surprising:
我的测试令人惊讶：
$ time sleep 1 > /dev/null 2>&1
real 0m1.036s
user 0m0.002s
sys 0m0.032s
The problem is the redirection was included as part of the command to be timed. Here was the solution for this test:
问题是重定向作为要计时的命令的一部分包含在内。这是此测试的解决方案：
$ (time sleep 1) > /dev/null 2>&1
I don't think this is part of your problem, but it seemed worth a mention.
我不认为这是您问题的一部分，但似乎值得一提。
回答by CenterOrbit
I prefer the &>> method better, but this is a solution as well:
我更喜欢 &>> 方法，但这也是一个解决方案：
$ script.sh 2>&1 |tee -a temp.txt
