Universal running of Python scripts You can pretty much universally run without the shebang (#!) with python myscript.py Or nearly equivalently (it places the current directory on your path and executes the module named myscript) (preferably do this!): python -m myscript from the command line, as long as you have Python installed and on your … Read more
If you have to hard code #!, use #!/usr/bin/env perl. Why? What you want is for the Perl program to run with the user’s preferred Perl. That’s going to be the first on in their PATH. #!perl doesn’t do what I mean, it doesn’t search the user’s PATH, #!/usr/bin/env perl is how you pull that … Read more
If your script is intended for use by Node developers, you should absolutely just use #!/usr/bin/env node and not bother trying for compatibility with people who only have Node installed as nodejs. Rationale: It’s what the cool kids are doing, and if you don’t do it too, you’re not cool. Major node projects like jshint, … Read more
Open the file in vim or vi, and administer the following command: :set ff=unix Save and exit: :wq Done! Explanation ff stands for file format, and can accept the values of unix (\n), dos (\r\n) and mac (\r) (only meant to be used on pre-intel macs, on modern macs use unix). To read more about … Read more
It’s called a shebang, and tells the parent shell which interpreter should be used to execute the script. #!/bin/sh <——— bourne shell compatible script #!/usr/bin/perl <– perl script #!/usr/bin/php <— php script #!/bin/false <—— do-nothing script, because false returns immediately anyways. Most scripting languages tend to interpret a line starting with # as comment and … Read more
#!/usr/bin/env searches PATH for bash, and bash is not always in /bin, particularly on non-Linux systems. For example, on my OpenBSD system, it’s in /usr/local/bin, since it was installed as an optional package. If you are absolutely sure bash is in /bin and will always be, there’s no harm in putting it directly in your … Read more
Limited to 127 chars on 99.9% of systems due to kernel compile time buffer limit. It’s limited in the kernel by BINPRM_BUF_SIZE, set in include/linux/binfmts.h.
On UNIX-like systems, you should always start scripts with a shebang line. The system call execve (which is responsible for starting programs) relies on an executable having either an executable header or a shebang line. From FreeBSD’s execve manual page: The execve() system call transforms the calling process into a new process. The new process … Read more
I use #!/usr/bin/perl in my scripts and configure Apache on Windows to ignore the shebang line. Add ScriptInterpreterSource Registry-Strict to your httpd.conf and set up the Windows Registry key as explained in the Apache docs. Here is what I get when I export the key: Windows Registry Editor Version 5.00 [HKEY_CLASSES_ROOT\.pl\Shell\ExecCGI\Command] @=”c:\\opt\\perl\\bin\\perl.exe” I have been … Read more
#!/usr/bin/env node is an instance of a shebang line: the very first line in an executable plain-text file on Unix-like platforms that tells the system what interpreter to pass that file to for execution, via the command line following the magic #! prefix (called shebang). Note: Windows does not support shebang lines, so they’re effectively … Read more