Here are examples for identifying the current SSH client and it’s corresponding version number that are currently running.

Note: Linux comes with OpenSSH

This system is using OpenSSH:
$ ssh -V
OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003

This system is using SSH2:
$ ssh -V
ssh: SSH Secure Shell (non-commercial version)
on i686-pc-linux-gnu

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