Hi Chuck,
the problem comes from the locale settings. You can see it as follows:
(In the examples replace en_US.UTF-8 with the locale you actually use. You can
check with the locale command)
$ mkdir old
$ cd old
$ touch a A A1 b c d E F G H
$ LANG=C ls
A A1 E F G H a b c d
$ LANG=en_US.UTF-8 ls
a A A1 b c d E F G H
See how they're sorted differently? So this means that in the C locale
the letters are sorted ABC...XYZabc...xzy, but in the other locales they
may be sorted differently, in most cases like this: aAbBcC...xXyYzZ
So when you specify [a-z] the results depend on the ordering of the
letters in the locale. You can also see this by noting that [a-z] does
*not* include Z but all other capital letters.
$ touch z Z
$ LANG=en_US.UTF-8 ls [a-z]*
a A A1 b c d E F G H z
$ LANG=en_US.UTF-8 ls [a-Z]*
a A A1 b c d E F G H z Z
So the behaviour is somewhat expected, though I agree that it is very
confusing. It would be interesting to know whether this was any
different in previous Ubuntu releases, but I'd guess it's the same
there.
I'm afraid I don't have an easy solution short of setting your locale to
C...
** Changed in: bash (Ubuntu)
Status: New => Confirmed
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[a-z] does not work as expected in non-C locales
https://bugs.launchpad.net/bugs/208100
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