如何附加“python --version"的输出到 bash shell 中的文件?

2022-01-22 00:00:00 python shell bash append

问题描述

我正在尝试编写一个简短的脚本来将我当前的 shell 会话的某些环境变量记录到文件中.不幸的是，python --version"的输出似乎忽略了(?)>>运算符并打印到shell而不是文件.

I'm trying to write a short script to log certain environment variables of my current shell session to file. Unfortunately the output of "python --version" seems to ignore (?) the >> operator and prints to the shell instead to the file.

我的最小(非)工作示例:

My minimal (not) working example:

rm path.log
echo "python --version" >> path.log
python --version >> path.log

我希望文件 path.log 将具有以下内容:

I would expect that the file path.log would then have the following content:

python --version
Python 2.6.6

但是Python 2.6.6"这一行会打印到 shell 而不是文件.我该如何解决这个问题?

But the line "Python 2.6.6" is printed to the shell and not to the file. How can I fix this?

谢谢！

PS:这完全适用于

gcc --version

解决方案

python --version 输出到STDERR.

你需要将STDERR合并到STDOUT中:

python --version >> path.log 2>&1

<小时>

作为参考，您可以通过以下方式验证此类行为:

For reference, you can verify such behavior by saying:

$ python --version 1>/dev/null
Python 2.7.4

上例中的STDOUT被重定向到/dev/null.这意味着输出被发送到 STDERR.

The STDOUT in the above example was redirected to /dev/null. This would imply that the output is being sent to STDERR.

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