All Rights Reserved. Please see the source code for details. The C-shells have a few commands not available in the Bourne shell.
Good examples are the alias command and the history command.
The versions on our systems were obtained from third-party software companies. All the shells have a few characters with special meaning, which will cause the shell to change the way it treats the command or the name you are typing. It can be used to do the same kinds of things. For more information on KSH you should either read the man page on ksh , or contact a ksh guru.