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?
- See also what is the appropriate shebang for Node.js.Dan Dascalescu– Dan Dascalescu2019-05-03 04:20:11 +00:00Commented May 3, 2019 at 4:20
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1 Answer
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.
4 Comments
kev
Does node ignore the first line?
# is not a comment in javascript.
ThiefMaster
Yes, if it's a shebang line. Otherwise it would be a SyntaxError.
Chris Jordan
YUI Compressor throws an error saying that this (the #!) is an illegal character. Further, my IDE (Eclipse) shows this as an error as well. What gives? Is it valid or not?
Tag Howard
It is indeed in the spec, but I can imagine that a lot of implementations just don't support it: 262.ecma-international.org/14.0/#sec-hashbang