preinst is in qgis-plugin-grass 2.0.1-2build2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
set -e
if [ "$1" = "install" -o "$1" = "upgrade" ]; then
dpkg-divert --package qgis-plugin-grass --add --rename --divert /usr/bin/qgis.bin /usr/bin/qgis
dpkg-divert --package qgis-plugin-grass --add --rename --divert /usr/bin/qbrowser.bin /usr/bin/qbrowser
fi
exit 0
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