kernel-source/get_release_number.sh

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#! /bin/sh
prefix=
suffix=
if [ "$3" = kernel-dummy -o -n "$suffix" ]; then
[ -n "$suffix" ] || suffix=$2
while [ "$suffix" != "${suffix#[^0-9]*.}" ]; do
suffix=${suffix#[^0-9]*.}
done
echo $prefix$suffix
else
echo "pkg:kernel-dummy"
fi