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As long as they're single commands. Running multiple commands using `&&`, etc. is unfortunately not portable.

What platform does `&&` not work on? It works fine in Windows `cmd`, which is the typical shell to worry about portability with.

cmd's `&&` is the equivalent of bash's `;`. bash's `&&` has no equivalent in cmd.

Edit: Never mind, I'm apparently wrong.

On Windows 7; note the lack of version information from Java:

> rm test.txt && java -version

rm: cannot unlink entry "test.txt": The system cannot find the file specified.

That's not correct. I use npm scripts with `&&` on Windows many times per day. Other features may not be portable, but that one definitely is.