> And to browse the code of the kernel (which is called
> uts):
> http://src.opensolaris.org/source/xref/onnv/onnv-gate/
> usr/src/uts/

The kernel isn't called "uts" (although Amdahl has their own Unix variant
for the mainframe that's called UTS, but I don't know that there's a 
connection).

However, "uts" is the directory in which the kernel source is contained.  I 
think
it once stood for "Unix Time-sharing System".  I think that directory name was
used fairly far back on the System V source lineage, before SVR4, anyway.  But
I think my old v7 source has /usr/src containing just commands and libs, and
/usr/sys (possibly as a separate filesystem - disks were _small_ back then!) 
holding
the kernel source.  I'd guess that directory first appeared somewhere after
v7 (1979) and around or before SVR2 (1984).

In other words, while quite a bit has been rewritten, refactored, and 
rearranged,
some things about how the kernel source code is arranged go back a _long_ way.
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