#!/bin/bash

bakpath="/srv/backup"
count="5"
num=$count

cd $bakpath

while [ -a daily0.dump ]; do
    if [ -a daily$num.dump ]; then
        echo "moving daily$num.dump to daily$((num+1)).dump"
        mv daily$num.dump daily$((num+1)).dump
    fi
    num=$((num-1))
done

echo "dumping postgresql dbs to a new daily0.dump"
sudo -u postgres pg_dumpall > daily0.dump

if [ -a daily$((count+1)).dump ]; then
    rm daily$((count+1)).dump
    echo "removing daily$((count+1)).dump"
fi

echo "done"

exit 0