preinst is in linux-wlan-ng 0.2.9+dfsg-6.
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 | #!/bin/sh -e
rm_conffile()
{
CONFFILE="$1"
if [ -e "$CONFFILE" ]; then
md5sum=`md5sum "$CONFFILE" | cut -d ' ' -f 1`
old_md5sum=`dpkg-query -W -f='${Conffiles}' linux-wlan-ng | grep $CONFFILE | cut -d ' ' -f 3`
if [ "$md5sum" != "$old_md5sum" ]; then
echo "Obsolete conffile $CONFFILE has been modified by you, renaming to .dpkg-bak"
mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
else
echo "Removing obsolete conffile $CONFFILE"
rm -f "$CONFFILE"
fi
fi
}
rm_conffile /etc/modprobe/linux-wlan-ng
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