PostgreSQL Database Backup/Restore migration help script

pg_backup.sh

#!/bin/sh
#

backupdir="./pg_backups"
pgdump_args="-bF c"
pgdumpall_globals_args=""

pg_backup() {
  if [ ! -d ${backupdir} ]; then
    echo Creating $backupdir
    mkdir -m 700 ${backupdir}
  fi

  echo
  echo "PostgreSQL backups"

  # Protect the data
  umask 077
  rc=$?
  now=`date "+%Y-%m-%dT%H:%M:%S"`
  file=${backupdir}/pgglobals_${now}
  pg_dumpall -g ${pgdumpall_globals_args} | gzip -9 > ${file}.gz

  db=$1
  while shift; do
      echo -n " $db"
      file=${backupdir}/pgdump_${db}_${now}
      pg_dump ${pgdump_args} -f ${file} ${db}
      [ $? -gt 0 ] && rc=3
          db=$1
  done

  if [ $rc -gt 0 ]; then
    echo
    echo "Errors reported during backup"
  fi
}

dbnames=`psql -q -t -A -d template1 -c "SELECT datname FROM pg_database WHERE datname != 'template0'"`
pg_backup $dbnames