Postgresql Server monitoring shell script

In this shell script will be helpful for monitoring RAM usage,DISK size,how many queries is running more than 5 minutes in a postgres cluster and how many dead tuble is occurred particular database in cluster,

How to create & run shell script file ?
create  a shell script file here created monitor.sh using vim editor and change the environment variable as well as db name as per your environment, i - for inserting mode then paste the following script then press Esc button then enter :wq for saving script then run the script using sh monitor.sh

$ cat monitor.sh

echo " "
echo " "
HOSTNAME=`hostname`
PSQL="/opt/PostgreSQL/9.3/bin/psql"
PORT=5432
HOST="localhost"
DB="template1"
USER="postgres"
echo "Enter the Time in minutes ,For example if you give 10 means script will displayed what are the query is running more than 10 minutes";
read time
echo "------***WHAT ARE THE QUERY IS RUNING MORE THAN $time MINUTES***------"
$PSQL -d $DB -U $USER -p $PORT <<EOF
\pset format wrapped
SELECT pid, now() - query_start as "runtime", usename, datname, state, query
  FROM  pg_stat_activity
  WHERE now() - query_start > '$time minutes'::interval
 ORDER BY runtime DESC;

EOF

echo " "
echo " "
echo " "

echo "------***CHECKING dISK SPACE***------"
        df -h

echo " "
echo " "
echo " "

echo "------***CHECKING RAM USAGE***------"
       free -h

echo " "
echo " "
echo " "
echo "Enter the dead tuble count for example if you give 5000 display the table count how many table having more than 5000 dead tubles in database ";
read count
echo "------***HOW MANY TABLES HAVING MORE THAN $count DEAD TUBLES PARTICULAR DATABASE***------"


$PSQL -d $DB -U $USER -p $PORT <<EOF
\c mhrorpar
select count(*) from pg_stat_all_tables where n_dead_tup > $count;
EOF

echo " "

$PSQL -d $DB -U $USER -p $PORT <<EOF
\c mhroraur
select count(*) from pg_stat_all_tables where n_dead_tup >$count;
EOF

echo " "

$PSQL -d $DB -U $USER -p $PORT <<EOF
\c mhroryav
select count(*) from pg_stat_all_tables where n_dead_tup >$count;
EOF

echo " "

$PSQL -d $DB -U $USER -p $PORT <<EOF
\c mhrorlat
select count(*) from pg_stat_all_tables where n_dead_tup >$count;
EOF

echo " "

$PSQL -d $DB -U $USER -p $PORT <<EOF
\c mhrornan
select count(*) from pg_stat_all_tables where n_dead_tup >$count;
EOF

echo " "

$PSQL -d $DB -U $USER -p $PORT <<EOF
\c mhrornad
select count(*) from pg_stat_all_tables where n_dead_tup >$count;
EOF