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/bin/sh then starts reading the file's contents and discovers the shebang (#!) right at the very beginning of the file 这，不是梗，这玩意叫做 shebang，也念做 hashbang。 当年创造 Unix 的人搞出它，用于 指定脚本的解释器 （也可以干其他的事情）。最初， 算是一种历史环境下的妥协 吧，但沿用至今了；不过， 现在有一些人不建议在新项目中继续使用 shebang。 另一位的回答已经说的很清楚了。你把一句 shebang 作为. To the shell, this is a token (magic number) by which it knows that the file contains a script
Now, how does it know which programming language the script is written it? C++ is a compiled language and does not have interpreter for it Using a shebang line to invoke the appropriate interpreter is not just for bash
You can use the shebang for any interpreted language on your system such as perl, python, php (cli) and many others.
The name shebang for the distinctive two characters comes from an inexact contraction of sharp bang or hash bang, referring to the two typical unix names for them Another theory on the sh in shebang is that it is from the default shell sh, usually invoked with shebang [18] [19] this usage was current by december 1987, [20] and. In addition to @zigg's answer, env may not be located at /usr/bin
Shebang comments are altogether a bad idea imho If your default script interpreter doesn't handle shebang comments, it is just a comment However, if you know the script interpreter can handle shebang comments, and you know the path to bash, there is no reason not to invoke it using its absolute path unless the path is too. An important aspect of this line is specifying which interpreter will be used
51 should i put the shebang in my python scripts
Put a shebang into a python script to indicate This module can be run as a script whether it can be run only on python2, python3 or is it python 2/3 compatible on posix, it is necessary if you want to run the script directly without invoking python executable explicitly are these. Is an human readable instance of a magic number consisting of the byte string 0x23 0x21, which is used by the exec() family of functions to determine whether the file to be executed is a script or a binary When the shebang is present, exec() will run the executable specified after the shebang instead
Note that this means that if you invoke a script by specifying the. 4 on linux, the shebang isn't very flexible According to multiple answers (stephen kitt's answer and jörg w mittag's), there is no designated way to pass multiple arguments in a shebang line I'm not sure if it will be of use to anyone, but i've written a short script to implement the lacking feature.
The shebang line usually points to the path of the interpreter
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