Citation :
${parameter%%word}
The word is expanded to produce a pattern just as
in pathname expansion. If the pattern matches a
trailing portion of the expanded value of parame�
ter, then the result of the expansion is the
expanded value of parameter with the shortest
matching pattern (the ``%'' case) or the longest
matching pattern (the ``%%'' case) deleted. If
parameter is @ or *, the pattern removal operation
is applied to each positional parameter in turn,
and the expansion is the resultant list. If param�
eter is an array variable subscripted with @ or *,
the pattern removal operation is applied to each
member of the array in turn, and the expansion is
the resultant list.
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