preinst is in analog 2:6.0-21.
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 | #!/bin/sh
set -e
if [ "$1" = upgrade ]; then
if [ -e "/etc/analog.conf" ] && [ ! -e "/etc/analog.cfg" ]; then
mv -f /etc/analog.conf /etc/analog.cfg
fi
fi
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