How to identify ancient KornShell version?

Solution 1:

CTRL+ALT+V

ESC, CTRL+V

This was discovered on a related question on the Unix & Linux SE:

How can I safely get the version of ksh? - Unix & Linux Stack Exchange

This revealed that we are running

Version M-11/16/88f

Maybe it's not that ancient after all!

Try what $(which ksh)

For example, on a Solaris 8 box:

$ what $(which ksh)
/usr/bin/ksh:
        Version M-11/16/88i
        SunOS 5.8 Generic 110662-24 Apr 2007