is there any way to hide port number while login with ssh that need custom port number

Question

I want to login to my server that has custom ssh port like -

ssh -p  root@example.com

Now I want such short comman

Answer 1

You can't do exactly that, but you can do something very similar. In your .bashrc add this line:

export myshortcode='-p <my server port number> root@example.com'

Now you execute the command loke this:

ssh $myshortcode

Or you add an alias like

alias ssh_port='ssh -p <my server port number> root@example.com'

Answer 2

Go to your ssh config file - mine is in $HOME/.ssh/config, and add the following:

Host example
HostName example.com
User root
Port 2229

Then you can just do:

ssh example

If you want to be able to run X11 applications (e.g. xclock or xterm or any graphical software development tools) on the remote machine, but display the graphics locally, you can forward X11 by adding the following 2 lines after the ones shown above:

ForwardX11 yes
ForwardX11Trusted yes

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In response to your further question in the comments. Yes, you can just keep adding as many additional servers as you like, with different ports, usernames, keep-alive intervals for each:

Host example
HostName example.com
User root
Port 2229

Host sercon
HostName sercon.onlinehome-server.info
User u8566723
Port 378
StrictHostKeyChecking no

You can also put a generic entry at the start with settings you want for most servers, and then override them later on individual servers:

Host *
Username mark
ServerAliveInterval 10

Host XYZ
<specific stuff for this host>

Host <ABC>
<specific stuff for this host>

To get further information, use this in Terminal:

man ssh_config

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If you happen to be on a Mac under macOS/OSX and you want X11 forwarding to work with XQuartz, put these 3 lines at the top of the file:

Host *
# https://serverfault.com/a/859370/235272
XAuthLocation /opt/X11/bin/xauth