preinst is in nut-server 2.7.1-1ubuntu1.
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 -e
if [ "$1" = upgrade ]; then
# remove the obsolete udev file(s)
[ -f /etc/udev/rules.d/025_nut-usbups.rules ] && rm -f /etc/udev/rules.d/025_nut-usbups.rules
[ -f /etc/udev/rules.d/52_nut-usbups.rules ] && rm -f /etc/udev/rules.d/52_nut-usbups.rules
[ -f /etc/udev/rules.d/52-nut-usbups.rules ] && rm -f /etc/udev/rules.d/52-nut-usbups.rules
fi
exit 0
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