Just to add to the article info about PSH.pm:

• Line editing: PSH.pm does not support command line editing per se. I'm using WinNT/Win2k and the Command Prompt window provides all command line editing and history features I need. If anyone likes PSH.pm and wants to extend it to optionaly use Term::ReadLine or something, I'm ready to help.
• Job Control: Since I'm using (and expecting others to use) PSH.pm usualy for debuging and testing things, then as a real shell I did not consider things like that. Besides ... you have the full power of Perl at your fingertips, you may do whatever you like.
• Piping: Any line starting with ! is passed to the default shell for processing. With only one speciality, if the line ends with a > then the output of the command will not be printed but stored in variable $it. Therefore if the default shell supports pipes ...

PSH.pm was never expected to be a real shell. It was more influenced by the interactive development interfaces of Prolog or ML.

Jenda