The other thing to be careful about is that the script is written in a way that a truncated script has no effect. This is because sh will execute the stdin line-by-line as it reads it, so if the download fails in the middle of a line the downloaded fragment of that line will be executed.

It can be the difference between `rm -rf ~/.cache/foo` and `rm -rf ~/`

The standard way to solve this problem is to put the entire script inside a function, invoke that function in the last line of the script (as the only other top-level statement other than the function definition), and name it in such a way that substrings of the name are unlikely to map to anything that already exists. Note that the bun.sh script does not do this, but also from a quick glance the only thing that could noticeably go wrong is this line:

    rmdir $bin_dir/bun-${target}

A truncated download could make it run `rmdir $bin_dir` instead, in which case it'll end up deleting ~/.bun instead of ~/.bun/bin/bun-${target}, which is probably not a big deal.