pg_dumpall

#!/bin/sh
#
# pg_dumpall [pg_dump parameters]
# dumps all databases to standard output
# It also dumps the pg_shadow table
#
# to adapt to System V vs. BSD 'echo'
#set -x
if echo '\\' | grep '\\\\' >/dev/null 2>&1
then	
	BS='\'			# BSD
else
	BS='\\'			# System V
fi
#
# Dump everyone but the postgres user
# initdb creates him
#
# get the postgres user id
#
POSTGRES_SUPER_USER_ID="`echo \" \
			select datdba \
			from pg_database \
			where datname = 'template1'; \" | \
			psql -A -q -t template1`"
echo "${BS}connect template1"
#
# delete all users in case they run this twice
#
# we don't use POSTGRES_SUPER_USER_ID because the postgres super user id
# could be different on the two installations
#
echo "select datdba into table tmp_pg_shadow \
      from pg_database where datname = 'template1';"
echo "delete from pg_shadow where usesysid <> tmp_pg_shadow.datdba;"
echo "drop table tmp_pg_shadow;"
#
# load all the non-postgres users
#
echo "copy pg_shadow from stdin;"
psql -q template1 <<END
select pg_shadow.* 
into table tmp_pg_shadow
from pg_shadow
where usesysid <> $POSTGRES_SUPER_USER_ID;
copy tmp_pg_shadow to stdout;
drop table tmp_pg_shadow;
END
echo "${BS}."
psql -l -A -q -t| tr '|' ' ' | grep -v '^template1 ' | \
while read DATABASE DBUSERID DATAPATH
do
	POSTGRES_USER="`echo \" \
		select usename \
		from pg_shadow \
		where usesysid = $DBUSERID; \" | \
		psql -A -q -t template1`"
	echo "${BS}connect template1 $POSTGRES_USER"
	echo "create database $DATABASE;"
	echo "${BS}connect $DATABASE $POSTGRES_USER"
	pg_dump ${1+"$@"} $DATABASE
	if [ "$?" -ne 0 ]
	then	echo "pg_dump failed on $DATABASE, exiting" 1>&2
		exit 1
	fi
done