preinst is in suckless-tools 42-1.
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 12 13 14 15 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ]; then
# If we upgrade from a version less than '41', remove dmenu alternatives
if dpkg --compare-versions "$2" lt "41"; then
update-alternatives --quiet --remove dmenu /usr/bin/dmenu.xft
update-alternatives --quiet --remove dmenu /usr/bin/dmenu.default
fi
fi
exit 0
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