preinst is in python-mmkeys 1.6.2.1-5.1.
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 | #!/bin/sh
set -e
# Switch from pycentral to pysupport
if [ "$1" = upgrade ] && dpkg --compare-versions "$2" lt 1.5.3-2 ; then
pycentral pkgremove python-mmkeys
fi
exit 0
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