Very Computer

1. is [ s1 = s2 ] a Bourne shell built-in?

My aging Unix manual shows that tests on strings and files using the
'test' command can be written using the alternative [ s1 = s2 ] form,
but I have always assumed it's still a call to an external command.
Accordingly, I endeavour to use 'case' in preference to either form
of test wherever possible, solely in the interests of speed.

But on glancing through the ksh manual, I see that the [ s1 = s2 ]
form of file and expression tests is built-in to ksh. I have been
surprised that more sh script writers do not use 'case' in place of
the square bracket tests, where feasible, and it occurs to me that
perhaps the square bracket tests are now also a part of the sh shell.

Is this so?  We don't have sh here, so I'm using bash or ksh instead.
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