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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,^[1][2]hashbang,^[3][4]pound-bang,^[5][6] or hash-pling.^[7]

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When a text file with a shebang is used as if it is an executable in a Unix-like operating system, the program loader mechanism parses the rest of the file's initial line as an interpreter directive. The loader executes the specified interpreter program, passing to it as an argument the path that was initially used when attempting to run the script, so that the program may use the file as input data.^[8] For example, if a script is named with the path path/to/script, and it starts with the following line, #!/bin/sh, then the program loader is instructed to run the program /bin/sh, passing path/to/script as the first argument.In Linux, this behavior is the result of both kernel and user-space code.^[9]

The shebang line is usually ignored by the interpreter, because the '#' character is a comment marker in many scripting languages; some language interpreters that do not use the hash mark to begin comments still may ignore the shebang line in recognition of its purpose.^[10]

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Syntax[edit]

The form of a shebang interpreter directive is as follows:^[8]

in which interpreter is an absolute path to an executable program.

The optional argument is a string representing a single argument. White space after #! is optional.

In Linux, the file specified by interpreter can be executed if it has the execute right and contains code which the kernel can execute directly, if it has a wrapper defined for it via sysctl (such as for executing Microsoft .exe binaries using wine), or if it contains a shebang. On Linux and Minix, an interpreter can also be a script. A chain of shebangs and wrappers yields a directly executable file that gets the encountered scripts as parameters in reverse order. For example, if file /bin/A is an executable file in ELF format, file /bin/B contains the shebang #!/bin/A optparam, and file /bin/C contains the shebang #!/bin/B, then executing file /bin/C resolves to /bin/B /bin/C, which finally resolves to /bin/A optparam /bin/B /bin/C.

In Solaris- and Darwin-derived operating systems (such as macOS), the file specified by interpreter must be an executable binary and cannot itself be a script.^[11]

Examples[edit]

Some typical shebang lines:

• #!/bin/sh – Execute the file using the Bourne shell, or a compatible shell, assumed to be in the /bin directory
• #!/bin/bash – Execute the file using the Bash shell
• #!/usr/bin/env python3 – Execute with a Python interpreter, using the env program search path to find it
• #!/bin/false – Do nothing, but return a non-zero exit status, indicating failure. Used to prevent stand-alone execution of a script file intended for execution in a specific context, such as by the . command from sh/bash, source from csh/tcsh, or as a .profile, .cshrc, or .login file.

Shebang lines may include specific options that are passed to the interpreter. However, implementations vary in the parsing behavior of options; for portability, only one option should be specified without any embedded whitespace. Further portability guidelines are found below.

Purpose[edit]

Interpreter directives allow scripts and data files to be used as commands, hiding the details of their implementation from users and other programs, by removing the need to prefix scripts with their interpreter on the command line.

A Bourne shell script that is identified by the path some/path/to/foo, has the initial line,

and is executed with parameters bar and baz as

provides a similar result as having actually executed the following command line instead:

If /bin/sh specifies the Bourne shell, then the end result is that all of the shell commands in the file some/path/to/foo are executed with the positional variables $1 and $2 having the values bar and baz, respectively. Also, because the initial number sign is the character used to introduce comments in the Bourne shell language (and in the languages understood by many other interpreters), the whole shebang line is ignored by the interpreter.

However, it is up to the interpreter to ignore the shebang line; thus, a script consisting of the following two lines simply echos both lines to standard output when run:

Strengths[edit]

When compared to the use of global association lists between file extensions and the interpreting applications, the interpreter directive method allows users to use interpreters not known at a global system level, and without administrator rights. It also allows specific selection of interpreter, without overloading the filename extensionnamespace (where one file extension refers to more than one file type), and allows the implementation language of a script to be changed without changing its invocation syntax by other programs. Invokers of the script need not know what the implementation language is as the script itself is responsible for specifying the interpreter to use.

Portability[edit]

Program location[edit]

Shebangs must specify absolute paths (or paths relative to current working directory) to system executables; this can cause problems on systems that have a non-standard file system layout. Even when systems have fairly standard paths, it is quite possible for variants of the same operating system to have different locations for the desired interpreter. Python, for example, might be in /usr/bin/python3, /usr/local/bin/python3, or even something like /home/username/bin/python3 if installed by an ordinary user.

A similar problem exists for the POSIX shell, since POSIX only required its name to be sh, but did not mandate a path. A common value is /bin/sh, but some systems such as Solaris have the POSIX-compatible shell at /usr/xpg4/bin/sh.^[12] In many Linux systems, /bin/sh is a hard or symbolic link to /bin/bash, the Bourne Again shell (BASH). Using bash-specific syntax while maintaining a shebang pointing to sh is also not portable.^[13]

Because of this it is sometimes required to edit the shebang line after copying a script from one computer to another because the path that was coded into the script may not apply on a new machine, depending on the consistency in past convention of placement of the interpreter. For this reason and because POSIX does not standardize path names, POSIX does not standardize the feature.^[14] The GNUAutoconf tool can test for system support with the macro AC_SYS_INTERPRETER.^[15]

Often, the program /usr/bin/env can be used to circumvent this limitation by introducing a level of indirection. #! is followed by /usr/bin/env, followed by the desired command without full path, as in this example:

This mostly works because the path /usr/bin/env is commonly used for the env utility,and it invokes the first sh found in the user's $PATH, typically /bin/sh.

This still has some portability issues with OpenServer 5.0.6 and Unicos 9.0.2 which have only /bin/env and no /usr/bin/env.

Character interpretation[edit]

Another portability problem is the interpretation of the command arguments.Some systems, including Linux, do not split up the arguments;^[16] for example, when running the script with the first line like,

all text after the first space is treated as a single argument, that is, python3 -c will be passed as one argument to /usr/bin/env, rather than two arguments. Cygwin also behaves this way.

Complex interpreter invocations are possible through the use of an additional wrapper. FreeBSD 6.0 (2005) introduced a -S option to its env as it changed the shebang-reading behavior to non-splitting. This option tells env to split the string itself.^[17] The GNU env utility since coreutils 8.30 (2018) also includes this feature.^[18] Although using this option mitigates the portability issue on the kernel end with splitting, it adds the requirement that env supports this particular extension.

Another problem is scripts containing a carriage return character immediately after the shebang line, perhaps as a result of being edited on a system that uses DOS line breaks, such as Microsoft Windows. Some systems interpret the carriage return character as part of the interpreter command, resulting in an error message.^[19]

Magic number[edit]

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The shebang is actually a human-readable instance of a magic number in the executable file, the magic byte string being 0x23 0x21, the two-character encoding in ASCII of #!. This magic number is detected by the 'exec' family of functions, which determine whether a file is a script or an executable binary. The presence of the shebang will result in the execution of the specified executable, usually an interpreter for the script's language. It has been claimed^[20] that some old versions of Unix expect the normal shebang to be followed by a space and a slash (#! /), but this appears to be untrue;^[21] rather, blanks after the shebang have traditionally been allowed, and sometimes documented with a space (see the 1980 email in history section below).

The shebang characters are represented by the same two bytes in extended ASCII encodings, including UTF-8, which is commonly used for scripts and other text files on current Unix-like systems. However, UTF-8 files may begin with the optional byte order mark (BOM); if the 'exec' function specifically detects the bytes 0x23 and 0x21, then the presence of the BOM (0xEF 0xBB 0xBF) before the shebang will prevent the script interpreter from being executed. Some authorities recommend against using the byte order mark in POSIX (Unix-like) scripts,^[22] for this reason and for wider interoperability and philosophical concerns. Additionally, a byte order mark is not necessary in UTF-8, as that encoding does not have endianness issues; it serves only to identify the encoding as UTF-8.

Etymology[edit]

An executable file starting with an interpreter directive is simply called a script, often prefaced with the name or general classification of the intended interpreter. The name shebang for the distinctive two characters may have come from an inexact contraction of 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.^[23] This usage was current by December 1989,^[24] and probably earlier.

History[edit]

The shebang was introduced by Dennis Ritchie between Edition 7 and 8 at Bell Laboratories. It was also added to the BSD releases from Berkeley's Computer Science Research (present at 2.8BSD^[25] and activated by default by 4.2BSD). As AT&T Bell Laboratories Edition 8 Unix, and later editions, were not released to the public, the first widely known appearance of this feature was on BSD.

The lack of an interpreter directive, but support for shell scripts, is apparent in the documentation from Version 7 Unix in 1979,^[26] which describes instead a facility of the Bourne shell where files with execute permission would be handled specially by the shell, which would (sometimes depending on initial characters in the script, such as ':' or '#') spawn a subshell which would interpret and run the commands contained in the file. In this model, scripts would only behave as other commands if called from within a Bourne shell. An attempt to directly execute such a file via the operating system's own exec() system trap would fail, preventing scripts from behaving uniformly as normal system commands.

In later versions of Unix-like systems, this inconsistency was removed. Dennis Ritchie introduced kernel support for interpreter directives in January 1980, for Version 8 Unix, with the following description:^[25]

The feature's creator didn't give it a name, however:^[27]

Kernel support for interpreter directives spread to other versions of Unix, and one modern implementation can be seen in the Linux kernel source in fs/binfmt_script.c.^[28]

This mechanism allows scripts to be used in virtually any context normal compiled programs can be, including as full system programs, and even as interpreters of other scripts. As a caveat, though, some early versions of kernel support limited the length of the interpreter directive to roughly 32 characters (just 16 in its first implementation), would fail to split the interpreter name from any parameters in the directive, or had other quirks. Additionally, some modern systems allow the entire mechanism to be constrained or disabled for security purposes (for example, set-user-id support has been disabled for scripts on many systems).

Note that, even in systems with full kernel support for the #!magic number, some scripts lacking interpreter directives (although usually still requiring execute permission) are still runnable by virtue of the legacy script handling of the Bourne shell, still present in many of its modern descendants. Scripts are then interpreted by the user's default shell.

See also[edit]

References[edit]

1. ^'Advanced Bash Scripting Guide: Chapter 2. Starting Off With a Sha-Bang'. Archived from the original on 10 December 2019. Retrieved 10 December 2019.
2. ^Cooper, Mendel (5 November 2010). Advanced Bash Scripting Guide 5.3 Volume 1. lulu.com. p. 5. ISBN978-1-4357-5218-4.
3. ^MacDonald, Matthew (2011). HTML5: The Missing Manual. Sebastopol, California: O'Reilly Media. p. 373. ISBN978-1-4493-0239-9.
4. ^Lutz, Mark (September 2009). Learning Python (4th ed.). O'Reilly Media. p. 48. ISBN978-0-596-15806-4.
5. ^Guelich, Gundavaram and Birznieks, Scott, Shishir and Gunther (29 July 2000). CGI Programming with PERL (2nd ed.). O'Reilly Media. p. 358. ISBN978-1-56592-419-2.
6. ^Lie Hetland, Magnus (4 October 2005). Beginning Python: From Novice to Professional. Apress. p. 21. ISBN978-1-59059-519-0.
7. ^Schitka, John (24 December 2002). Linux+ Guide to Linux Certification. Course Technology. p. 353. ISBN978-0-619-13004-6.
8. ^ ^ab'execve(2) - Linux man page'. Retrieved 21 October 2010.
9. ^Corbet, Jonathan. 'The case of the supersized shebang'. LWN.net.
10. ^'SRFI 22'.
11. ^https://stackoverflow.com/questions/45444823/python3-shebang-line-not-working-as-expected
12. ^'The Open Group Base Specifications Issue 7'. 2008. Retrieved 5 April 2010.
13. ^'pixelbeat.org: Common shell script mistakes'. It's much better to test scripts directly in a POSIX compliant shell if possible. The `bash --posix` option doesn't suffice as it still accepts some 'bashisms'
14. ^'Chapter 2. Shell Command Language', The Open Group Base Specifications (IEEE Std 1003.1-2017) (Issue 7 ed.), IEEE, 2018 [2008], If the first line of a file of shell commands starts with the characters '#!', the results are unspecified.
15. ^Autoconf, Free Software Foundation, Macro: AC_SYS_INTERPRETER: Check whether the system supports starting scripts with a line of the form ‘#!/bin/sh’ to select the interpreter to use for the script.
16. ^'/usr/bin/env behaviour'. Mail-index.netbsd.org. 9 November 2008. Retrieved 18 November 2010.
17. ^env(1) – FreeBSD General Commands Manual
18. ^'env invocation'. GNU Coreutils. Retrieved 11 February 2020.
19. ^'Carriage Return causes bash to fail'. 8 November 2013.
20. ^'GNU Autoconf Manual v2.57, Chapter 10: Portable Shell Programming'. Archived from the original on 18 January 2008. Retrieved 14 May 2020.
21. ^'The #! magic, details about the shebang/hash-bang mechanism on various Unix flavours'. Retrieved 14 May 2020.
22. ^'FAQ - UTF-8, UTF-16, UTF-32 & BOM: Can a UTF-8 data stream contain the BOM character (in UTF-8 form)? If yes, then can I still assume the remaining UTF-8 bytes are in big-endian order?'. Retrieved 4 January 2009.
23. ^'Jargon File entry for shebang'. Catb.org. Retrieved 16 June 2010.
24. ^Wall, Larry. 'Perl didn't grok setuid scripts that had a space on the first line between the shebang and the interpreter name'. USENET.
25. ^ ^ab'CSRG Archive CD-ROMs'.
26. ^UNIX TIME-SHARING SYSTEM: UNIX PROGRAMMER'S MANUAL(PDF), 2A (Seventh ed.), January 1979
27. ^Richie, Dennis. 'Dennis Ritchie and Hash-Bang'. Talisman.org. Retrieved 3 December 2020.
28. ^Rubini, Alessandro (31 December 1997). 'Playing with Binary Formats'. Linux Journal. Retrieved 1 January 2015.

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External links[edit]

• #! - the Unix truth as far as I know it (a more generic approach)

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