[Toybox] [PATCH] Implement mv -n / cp -n (no clobber).

[Andy Chu]

> 3) Security features for distributed systems ... sh is obviously not
> designed for untrusted input (including what's on the file system).

4) ... along these same lines, a lot of other people are annoyed by
the gratuitous and crippled shell in make:

https://github.com/apenwarr/redo -- implementation of a DJB design,
each rule is a shell file, so you automatically get the property that
changing the command line/rule invalidates the output, which Make
doesn't have)

https://github.com/danfuzz/blur -- from the author of the Android.mk
system (which slurps a big tree Make fragments into a single
namespaced Makefile).  I guess he got sick of Makefiles after that ...

Both of these have issues but are interesting... I think it wouldn't
be too hard to make a shell in which you could IMPLEMENT make.  It
seems like you've gone a little in that direction with your "isnewer"
checks in scripts/make.sh!

The problem is that all this stuff is at the foundational layer, and
being backward compatible with both shell AND make is a very tall
order (although I guess that's where my interests overlap with toybox)

Andy

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