Korn Shell. What is korn shell (ksh)? The korn shell has most of the features which one can be found in the bourne shell as well as the c shell.
![Korn Shell](https://tse1.mm.bing.net/th?q=Korn%20Shell&w=1280&h=720&c=5&rs=1&p=0)
The korn shell is an interactive command and scripting language for accessing unix® and other computer systems. $ppid is the process id of its parent.