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Meaning of #!/bin/bash at the beginning of a file

Question by Guest | 2016-09-28 at 22:34

I got a bundle of files all having the string or term "#!/bin/bash" directly at their beginning.

Of course, those characters are just hieroglyphs for me. Nevertheless, I would really like to know what the meaning of those characters could be.

What kind of files are those? On Windows, they are just opening in the usual text editor.

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Windows cannot do much with those files. Your files are namely so-called batch scripts for UNIX systems such as Linux or Mac OS X.

Using such batch scripts, you can automate computer tasks. In the question "What is a batch script" I have written an answer explaining what that means exactly in detail.

The meaning of "#!/bin/bash" is the following: The # at the beginning of the line indicates that this line is a comment. Therefore, the line will not be executed in the script. The "#!" (# and ! together) is called Shebang or Magic Line. On UNIX systems you can specify with this that the script should be executed using the specified program respectively interpreter (in this case /bin/bash). Instead Of "/bin/bash" you can also execute a script using another interpreter. For example "/bin/sh" or "/bin/dash". Each interpreter may have other supported functions, so that you can specify the application of your choice here depending on the task you want to do.

By the way, batch scripts can be edited using a normal text editor. Therefore, on Windows the Editor is used for opening. 
2016-09-29 at 17:11

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