Change SSH Port

change_ssh_port.sh

#!/bin/bash

abort() {
	echo "$@"
	exit 1
}

check_user() {
	if [ "$(id -u)" -ne 0 ]; then
		abort "Harap jalankan script sebagai root atau dengan sudo."
	fi
}

check_port() {
	read -p "Masukkan port SSH baru: " NEW_PORT
	if ! [[ "$NEW_PORT" =~ ^[0-9]+$ ]] || [ "$NEW_PORT" -lt 1024 ] || [ "$NEW_PORT" -gt 65535 ]; then
		abort "Port tidak valid. Gunakan angka antara 1024 - 65535."
	fi

	if ss -tuln | grep -q ":$NEW_PORT "; then
		abort "Port $NEW_PORT sudah digunakan oleh layanan lain. Pilih port lain."
	fi
}

change_port() {
	sudo apt install openssh-server -y

	sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak
	sudo chmod a-w /etc/ssh/sshd_config.bak

	sed -i "s/^#Port 22/Port $NEW_PORT/" /etc/ssh/sshd_config
	sed -i "s/^Port [0-9]*/Port $NEW_PORT/" /etc/ssh/sshd_config
}

apply() {
	sudo systemctl restart ssh
	sudo service ssh restart
	sudo systemctl status ssh
}

main() {
	check_user
	check_port
	change_port
	apply
}

main || abort "Fail"

/bin/bash -c "$(curl -fsSL https://gist.githubusercontent.com/KAnggara75/f1f6e6a951680119eef607ee7eecc52f/raw/e2b50daeb18b88dff81552b50218803262dda44f/change_ssh_port.sh)"