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Some scripting languages (such as Python or Bash) use # for comments.
#!/usr/bin/env python print 'hello, world' I can run the script:
python script.py Or
./script.py Is it possible to make JavaScript support shebang?
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Shebang is a OS feature and can be used to run any interpreted language: Python, Perl, etc. For Node.js it can (but often doesn't) look like this: #!/usr/bin/node. Node.
This is not the case; Node. js can be used on the frontend as well as the backend. The event-driven, non-blocking nature of Node. js frameworks is one of the reasons it is a popular choice for developers designing a flexible and scalable backend.
#!/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).
Create a NodeJS command-line script. You may already know that we can execute a NodeJS script file by running: node script. js . That is fine in most cases, but a NodeJS command-line script is a regular JavaScript file, except that it contains a special shell-instruction.
Yes, you can simply use #!/usr/bin/env node (or whatever the name of your JavaScript interpreter is, it works fine with js (spidermonkey), too).
[me@hades:~]> cat > test.js #!/usr/bin/env node console.log('hi'); [me@hades:~]> chmod +x test.js [me@hades:~]> ./test.js hi Most likely both interpreters test if the first line begins with #! and in this case it is skipped.
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