sh-script.el pairs

[Andreas Röhler]

Herewith a patch against latest sh-script.el from
2008-02-10.

It conceives opening and closing of shell-programming
constructs as pairs.

Thus you may switch inside a if-fi, while-done etc. to
the closing or opening. Nesting is calculated.

Once the end or beginning is reached, you may jump as
known from `match-paren'. Keys are provided respective.

Andreas Röhler
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