preinst is in how-can-i-help 16.
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 | #!/bin/sh
set -e
DATADIR="/var/lib/how-can-i-help"
# remove old data directory on upgrade
if [ "$1" = "upgrade" ] && [ -d "$DATADIR" ]
then
rm -rf "$DATADIR"
fi
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