port.sh

# 使用方法
$ nmap -p [port] [hostname or IP]

# リモートサーバのポートが空いている場合
$ nmap -p 22 192.168.1.2

Starting Nmap 6.40 ( http://nmap.org ) at 2019-10-12 13:32 UTC
Nmap scan report for 192.168.1.2
Host is up (0.0019s latency).
PORT   STATE SERVICE
22/tcp open  ssh

Nmap done: 1 IP address (1 host up) scanned in 0.44 seconds

# リモートサーバのポートが閉じている場合
$ nmap -p 22 192.168.1.3

Starting Nmap 6.40 ( http://nmap.org ) at 2019-10-12 13:40 UTC
Nmap scan report for 192.168.1.3
Host is up (0.0018s latency).
PORT   STATE  SERVICE
22/tcp closed ssh

Nmap done: 1 IP address (1 host up) scanned in 0.40 seconds