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Prelude scripts in app-bundles

I've updated my how-to article on raising the open-files limit for Java apps:
<http://www.amug.org/~glguerin/howto/More-open-files.html>

The new version should work even on machines without the full BSD
sub-system installed, that is, when 'dirname' is not present.

The trick is to replace this line in the prelude-script:
here=`dirname "$0"`

with this paragon of lucidity:
here="${0%/*}"

The expression being assigned to "here" isn't random line noise. It means:
Strip the shortest suffixed pattern matching "/*" from the "$0" parameter.

Since $0 is the full pathname of the shell-script, and the shortest suffix
matching the shell-pattern "/*" is simply the leaf-name of the shell-script
itself, the result is the same as executing `dirname "$0"` in this
particular situation.

For reference, see the section of 'man sh' below "substring processing".
For experimenters, 'dirname' is still more powerful than mere substring
conjuring with shell expressions.

-- GG
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