Checks for open/closed ssh ports using nmap command
In this tutorial, How to checks all ports if they are closed or open and if the current ssh version? Using nmap command. Read man nmap page.
For ubuntu
For centos
For example, checks for open/closed ports and current ssh version
The output Checks for open/closed ssh ports using nmap command as below

The first, you have install nmap.
For ubuntu
$ sudo apt-get install nmap
For centos
$ sudo yum install nmap
For example, checks for open/closed ports and current ssh version
[huupv@huupv huuphan.com]$ sudo nmap -sV -p22 --version-all localhost
The output Checks for open/closed ssh ports using nmap command as below
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