TCP Connect port scanner in bash

I got bored so i created this novel tcp connect scanner in bash.

#!/usr/bin/env bash

host='127.0.0.1';

main() {

    ## Scan the range 0-1024 looking for open ports on the specified host.
    ## Try to ident the service running on each port using /etc/services file.
    scan_tcp "${host}"
}

scan_tcp() {
    hst=$1;

    echo -e "PORT\tSERVICE\tSTATE\n";
    
    for port in `seq 1 1024` 
    do
        (echo 3<>/dev/tcp/${hst}/${port}) &>/dev/null

        if [ $? == 0 ]
        then
            service=$( grep -E "${port}\/tcp" /etc/services | awk '{print $1}' | head -n 1 );          
            echo -e "${port}\t${service}\tOPEN"
        fi
    done
}

main;

Here is the result of the scan:

sam@asus:~/pentest_notes% ./tcp_connect_scanner.sh
PORT	SERVICE	STATE

21	ftp	OPEN
22	ssh	OPEN
25	smtp	OPEN
53	domain	OPEN
80	http	OPEN
110	pop3	OPEN
111	sunrpc	OPEN
139	netbios-ssn	OPEN
143	imap2	OPEN
389	ldap	OPEN
445	microsoft-ds	OPEN
631	ipp	OPEN
953		OPEN
sam@asus:~/pentest_notes%