HowTo find Out KSH ( Korn Shell ) Version

How do I check ksh version? How do I find out ksh version under UNIX like operating systems?

The original Korn shell version is known as ksh88. It is default on many UNIX like operating system including AIX 4. The ksh93 is an updated version. There are also modified versions of ksh93 which add new features. To get ksh version open a command-line terminal (select Applications > Accessories > Terminal), and then type the following command:

 
ksh --version
 

OR

 
echo ${.sh.version}
 

OR

 
echo $KSH_VERSION
 

Sample outputs:

Fig.01: UNIX Check ksh version command ouput

The above version indicates that I'm using the official ksh93t+ version. It was released on 2010-03-09. If above command failed try pressing ^V ( control + V ) OR ESC + ^V ( Escape followed by control + V ) to display version of the shell in Emacs mode.