A shell script to upgrade between versions of PostgreSQL on Debian. Use at your own risk.

debian_upgrade_postgresql.sh

#!/bin/sh

if [ $# -ne 2 ] 
then
  echo "Usage: $0 <from> <to>"
	exit 1
fi

from=$1
to=$2

for s in $from $to
do
	ln -s /etc/postgresql/$s/main/*.conf /var/lib/postgresql/$s/main/
done

/usr/lib/postgresql/$to/bin/pg_upgrade \
	-k \
	-b /usr/lib/postgresql/$from/bin \
	-B /usr/lib/postgresql/$to/bin \
	-d /var/lib/postgresql/$from/main/ \
	-D /var/lib/postgresql/$to/main/

for s in $from $to
do
	rm -f /var/lib/postgresql/$s/main/*.conf
done