#!/bin/sh

CMT="PostgreSQL User Account" 

chkpgsq() {
    echo "ADD=1" > /tmp/chk$$
    awk ' BEGIN { FS=":" } { print $1 } ' $1 | while read f
    do
        [ "$f" = "postgres" ] && echo "ADD=" > /tmp/chk$$
    done
}

addgrppgsq() {
    groupadd postgres
}

addusrpgsq() {
    useradd -g postgres -d /usr/local/pgsql -s /bin/sh -c "$CMT" postgres
    echo "Setting the password for the newly created 'postgres' user account."
    passwd postgres
}

chkpgsq /etc/group
. /tmp/chk$$
[ "$ADD" ] && addgrppgsq
chkpgsq /etc/passwd
. /tmp/chk$$
[ "$ADD" ] && {
    addusrpgsq
}
rm -f /tmp/chk$$