//usr/bin/go run $0 $@ ; exit example: //usr/bin/go run $0 $@ ; exit package main import “fmt” func main() { fmt.Println(“Hello World!”) } go treat // as a single line comment and shell ignore extra / Update: Go installation may be in a different location. The syntax below will take that into account, and works … Read more
Generally, take care of some pitfalls: set the executable flag on the script: chmod u+x test.py try to execute with a preceding dot “./”, so call ./test.py otherwise it might execute some other script from within your PATH also make sure you don’t have windows line endings, this seems to prevent the shebang evaluation, too. … 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
Recommended reading: The UNIX FAQ: Why do some scripts start with #! … ? The #! magic, details about the shebang/hash-bang mechanism on various Unix flavours Wikipedia: Shebang The unix kernel’s program loader is responsible for doing this. When exec() is called, it asks the kernel to load the program from the file at its … 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
#!/usr/bin/env python is more portable because in general the program /usr/bin/env can be used to “activate” the desired command without full path. Otherwise, you would have to specify the full path of the Python interpreter, which can vary. So no matter if the Python interpreter was in /usr/bin/python or in /usr/local/bin/python or in your home … Read more
env is the name of a Unix program. If you read the manual (man env) you can see that one way to use it is env COMMAND, where in your case, COMMAND is python3. According to the manual, this will Set each NAME to VALUE in the environment and run COMMAND. Running env alone will … Read more
#!/usr/bin/python is hardcoded to always run /usr/bin/python, while #!/usr/bin/env python will run whichever python would be default in your current environment (it will take in account for example $PATH, you can check which python interpreter will be used with which python). The second way ( #!/usr/bin/env python ) is preferred , as it’s not dependent … Read more
The node shebang is: #!/usr/bin/env node Not all systems place node in the same location, its possible that you have the location incorrectly. This will find them all. Source Also
Read up on the Python Launcher for Windows in the docs, which was initially described in PEP 397. It lets you define custom shebang configurations in “py.ini” (e.g. to use pypy), and out of the box you can use virtual shebangs such as #!/usr/bin/env python3, or shebangs with real paths such as #!”C:\Python33\python.exe”. (Quoting is … Read more