Switch postgresql version for all the commands with using alternatives.

alternatives-pgsql

#!/bin/sh

# alternatives-pgsql
#
# Switch postgresql version for all the commands with using alternatives.
#
# Copyright(C) 2012 Uptime Technologies, LLC. All rights reserved.

PATH=/usr/sbin:$PATH
export PATH

NUM=$1

if [ -z $NUM ]; then
  echo "id must be specified. abort."
  echo "Usage; $0 <num>"
  echo "" | alternatives --config pgsql-psql | grep bin/psql
  echo
  exit;
fi;

find /etc/alternatives/pgsql-* | \
  perl -e 's,.*/,,' -p | \
  awk '{ print "echo '$NUM' | alternatives --config " $1 }' | \
  sh

echo "" | alternatives --config pgsql-psql

Just adding for anyone else that finds this post, can also use a one-liner in the form of:

find /etc/alternatives/ -name 'pgsql-' -exec basename {} ; | xargs -L 1 alternatives --auto

In case someone finds this on google again there was a slight typo in the command.
find /etc/alternatives/ -name 'pgsql-*' -exec basename {} \; | xargs -L 1 alternatives --auto