由于UTF-8 BOM(字节顺序标记)而未找到Shebang可执行文件 [英] Shebang executable not found because of UTF-8 BOM (Byte Order Mark)

问题描述

出于某种原因，我的一个脚本中的shebang无效:

For some reason the shebang in one of my scripts does not work:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
print "Hello World"

执行此文件时，出现错误

When I execute this file, I get an error

 % ./test.py
./test.py: 1: #!/usr/bin/env: not found

我的/usr/bin/目录的内容没有问题: env 和 python 都存在，并且执行正确权利.

There is no problem with the content of my /usr/bin/ directory: both env and python are there, with correct execution rights.

推荐答案

这是由于Unix和Linux如何处理shebang. #！ 必须是前两个字节.如果您有BOM，则不再适用，因此会出现错误.

This is due to how Unix and Linux handle the shebang. #! must be the first two bytes in the file. If you have a BOM then this isn't true anymore hence the error.

请注意，从python解释器的角度来看，放置BOM完全没有用，因为#-*-编码:utf-8-*-已经告诉了python编码.

Note that putting a BOM is completely useless from the point of view of the python interpreter, since the # -*- coding: utf-8 -*- already tells python the encoding.

AFAIK BOM表通常不与utf-8一起使用.它用于UTF-16等以指定字节顺序.如果编辑器假定编码错误，则应该可以使用正确的编码显式打开文件.

AFAIK BOM is usually not used with utf-8. It is used for UTF-16 et similia in order to specify the byte-order. If the editor assumes the wrong encoding you should be able to explicitly open the file with the correct encoding.

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