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Without -S, `uv run --script` would be treated as a binary name (including spaces) and you will get an error like "env: ‘uv run --script’: No such file or directory".

-S causes the string to be split on spaces and so the arguments are passed correctly.



On these systems, wouldn’t binfmt attempt to exec(“/usr/bin/env -S uv run --script”, “foo.py”) and fail anyway for the same reason?


No. The string is split to extract at most one argument. See: https://linux.die.net/man/2/execve

So in fact "-S" is not passed as a separate argument, but as a prefix in the first (and only) argument, and env then extracts it and acts accordingly:

``` $ /usr/bin/env "-S echo deadbeef" deadbeef ```


Most systems split at least the 1st space since decades.




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