SSH clients are available at the command line in all the major operating systems:

• In MS Windows, there is not one available at the classic command prompt, but it is available in powershell. type “Powershell” in the Windows Search box and select “Windows PowerShell”. In the window that pops up, enter your ''ssh'' command at the prompt.
• In MacOS,run the “Terminal” app. In the window that pops up, enter your ssh command at the prompt.
• In Linux or any unix-like OS, open a shell window in the GUI, or right on the command line, enter your ssh command at the prompt (you may need to install with a package manager if you have a crazy-barebones installation of linux).

The classic MS Windows ssh is Putty.