在计算机科学中，Shebang（也称为 Hashbang ）是一个由井号和叹号构成的字符串行 #! ，其出现在文本文档的第一行的前两个字符。 在文档中存在 Shebang 的情况下，类 Unix 操作系统的进程载入器会分析 Shebang 后的内容，将这些内容作为解释器指令，并调用该指令，并将载有 Shebang 的文档路径作为该解释器的参数。

例如，以指令

开头的文档在执行时会实际调用 /bin/sh 进程（通常是 Bourne shell 或兼容的 shell，例如 bash、dash 等）来执行。这行内容也是 shell 脚本的标准起始行。

In computing, a shebang is the character sequence consisting of the characters number sign and exclamation mark (#!) at the beginning of a script. It is also called sha-bang, hashbang, pound-bang, or hash-pling.

Under Unix-like operating systems, when a script with a shebang is run as a program, the program loader parses the rest of the script's initial line as an interpreter directive; the specified interpreter program is run instead, passing to it as an argument the path that was initially used when attempting to run the script. For example, if a script is named with the path path/to/script, and it starts with the following line: