preinst is in powermgmt-base 1.31+nmu1.
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 16 17 18 19 20 21 22 23 | #!/bin/sh -e
case "${1}" in
(install|upgrade)
if [ -f /etc/modutils/apmd ]; then
if [ -f /etc/modutils/apm ]; then
# retire
mv -f /etc/modutils/apmd /etc/modutils/apmd.dpkg-old
else
# kidnap
mv -f /etc/modutils/apmd /etc/modutils/apm
fi
fi
;;
(abort-upgrade)
;;
(*)
echo "preinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
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