Postgres rotate cron backups - sql

Question

I`m trying to make a script which will make following:
Connect to postgres database, make dump, gzip dump and store to dir.
All this must be rotated - 24 backups for day, 7 for week
File name must contain date, hour and minutes in file name.
Old ones must be deleted (I dont want more backus as described)
This script will run every hour trough cron.
I wrote this script (change some found at web) but there are some bugs:
1) It says: "awk: line 1: syntax error at or near end of line"
2) when I run script it on overwrites dayly backup and don`t make new one
3) hour backup make only folder with name "hourly" and didn`t make backup
4) all backups will be backed up to synology NAS via rsync
Can anyone help me please?
Script backup.sh:
# !/bin/bash
# for use with cron, eg:
# 0 3 * * * postgres /var/db/db_backup.sh example_db
if [[ -z "$1" ]]; then
echo "Usage: $0 <example_db> [pg_dump example_db]"
exit 1
fi
DB="$1"; shift
DUMP_EXAMPLE_DB=$#
DIR="/var/db/backups/$DB"
KEEP_HOURLY=24
KEEP_DAILY=7
KEEP_WEEKLY=5
KEEP_MONTHLY=12
function rotate {
rotation=$1
fdate=`date +%Y-%m-%d-$H -d $date`
file=$DIR/daily/*$fdate*.gz
mkdir -p $DIR/$rotation/ || abort
if [ -f $file ]; then
cp $file $DIR/$rotation/ || abort
else
echo
fi
}
function prune {
dir=$DIR/$1
keep=$2
ls $dir | sort -rn | awk " NR > $keep" | while read f; do rm $dir/$f; done
}
function abort {
echo "aborting..."
exit 1
}
mkdir -p $DIR/hourly || abort
mkdir -p $DIR/daily || abort
mkdir -p $DIR/weekly || abort
mkdir -p $DIR/monthly || abort
mkdir -p $DIR/yearly || abort
date=`date +%Y-%m-%d` || abort
hour=`date -d $date +%H` || abort
minute=`date -d $date +M` || abort
day=`date -d $date +%d` || abort
weekday=`date -d $date +%w` || abort
month=`date -d $date +%m` || abort
# Do the daily backup
/usr/bin/pg_dump $DB $DUMP_EXAMPLE_DB | gzip > $DIR/daily/${DB}_$date.gz
test ${PIPESTATUS[0]} -eq 0 || abort
# Perform rotations
if [[ "$weekday" == "0" ]]; then
rotate weekly
fi
if [[ "$hour/$minute" == "0/0" ]]; then
rotate hourly
fi
if [[ "$day" == "01" ]]; then
rotate monthly
fi
if [[ "$month/$day" == "01/01" ]]; then
rotate yearly
fi
prune hourly $KEEP_HOURLY
prune daily $KEEP_DAILY
prune weekly $KEEP_WEEKLY
prune monthly $KEEP_MONTHLYOD
Many Thanks