34 lines
1.5 KiB
Markdown
34 lines
1.5 KiB
Markdown
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### Argument parsing and shebang (`#!`) lines
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In CoffeeScript 1.x, `--` was required after the path and filename of the script to be run, but before any arguments passed to that script. This convention is now deprecated. So instead of:
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```bash
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coffee [options] path/to/script.coffee -- [args]
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```
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Now you would just type:
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```bash
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coffee [options] path/to/script.coffee [args]
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```
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The deprecated version will still work, but it will print a warning before running the script.
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On non-Windows platforms, a `.coffee` file can be made executable by adding a shebang (`#!`) line at the top of the file and marking the file as executable. For example:
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```coffee
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#!/usr/bin/env coffee
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x = 2 + 2
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console.log x
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```
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If this were saved as `executable.coffee`, it could be made executable and run:
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```bash
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▶ chmod +x ./executable.coffee
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▶ ./executable.coffee
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4
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```
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In CoffeeScript 1.x, this used to fail when trying to pass arguments to the script. Some users on OS X worked around the problem by using `#!/usr/bin/env coffee --` as the first line of the file. That didn’t work on Linux, however, which cannot parse shebang lines with more than a single argument. While such scripts will still run on OS X, CoffeeScript will now display a warning before compiling or evaluating files that begin with a too-long shebang line. Now that CoffeeScript 2 supports passing arguments without needing `--`, we recommend simply changing the shebang lines in such scripts to just `#!/usr/bin/env coffee`.
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