Simple SH script to monitor basic connection counts on *nix systems

I wrote near a year ago a sh script to see my traffic information which can be used to see basic connection counts like unix connection count, tcp connection count, http inbound and outgoing request counts and ftp connection count, ssh connection count.
Save as mycons.sh then run the command

chmod +x mycons.sh

For short access run

ln mycons.sh /bin/mycons

Sample usage after shortcut

mycons -hl

Here is the code for mycons.sh: http://pastebin.com/dBpPMGeY

#HEADER SECTION STARTS
#------------------------------------------------------------------------
#This script is written by Mustafa TURAN (HOME http://mustafaturan.net/
#BLOG http://vpslife.blogspot.com/) to monitor some basic network actions
#and display some user specific information like hd usage...
#you are feel free to distribute re-use in any of your application
#without deleting HEADER section. Also, it licensed with CC 3.0
#Also see: http://creativecommons.org/licenses/by/3.0/
#-------------------------------------------------------------------------
#HEADER SECTION ENDS


#
# Function to print help
#
print_help()
{
        echo "Usage: $0 -c -h -l -i";
        echo "Where -c clear screen";
        echo "      -h shows hd usage size";
        echo "      -l count of connections";
        echo "      -i show ip list";
        return
}

#
# Function to clear the screen
#
cls()
{
        clear
        return
}

#
# Function to show hd space
#
print_hdspace()
{
        echo -n "Total Space Used: "
        /usr/bin/du -hs /home/www-data/mustafat #write here your home path
        echo "-------------------------------------------------------------------------"
        return
}

#
# Function to connection counts
#
print_connection_count()
{
        unix_connections=`/bin/netstat -an | grep unix | grep CONNECTED | wc -l` #unix connection count
        tcp_connections=`/bin/netstat -an | grep ESTABLISHED | wc -l` #tcp connection count
        ftp_connections=`/bin/netstat -an | grep :21\  | grep ESTABLISHED | wc -l` #fcp connection count
        ssh_connections=`/bin/netstat -an | grep :22\  | grep ESTABLISHED | wc -l` #ssh connection count
        http_connections=`/bin/netstat -an | grep :80\  | grep ESTABLISHED | wc -l` #http connection count
        h_out_connections=`/bin/netstat -an | grep :80\  | grep ESTABLISHED |  awk '{print $5}' | grep :80 | wc -l` #http requests count (downloading file from somewhere else)
        h_in_connections=`/bin/netstat -an | grep :80\  | grep ESTABLISHED |  awk '{print $4}' | grep :80 | wc -l` #http response count (someone display a web page from this server)

        echo "CONNECTIONS"
        echo "-------------------------------------------------------------------------"
        echo -e "UNIX\tTCP\tFTP\tSSH\tHTTP\tH-Input\tH-Output"
        echo -e "$unix_connections\t$tcp_connections\t$ftp_connections\t$ssh_connections\t$http_connections\t$h_in_connections\t$h_out_connections\n"
        return
}

#
# Function to ip list http connections
#
print_iplist()
{
        echo "List of ip addresses:"
        echo "-------------------------------------------------------------------------"
        /bin/netstat -an | grep :80 | grep ESTABLISHED | awk '{print $5}'
        return
}

#
# Main procedure start here
#
# Check for sufficent args
#

if [ $# -eq 0 ] ; then
    print_help
    exit 1
fi

# Now parse command line arguments
#
while getopts chlik: opt
do
    case "$opt" in
        c) cls;;
        h) print_hdspace;;
        l) print_connection_count;;
        i) print_iplist;;
        \?) print_help; exit 1;;
    esac
done