freevms

> I think the OpenVMS's DCL interface has a libre implementation. I know about https://github.com/rroart/freevms/tree/master/dcl/src but my impression was FreeVMS is too incomplete to use in anger. > I've seen things like mpsh You mean https://cca.org/mpsh/ ? I am wondering how close it is to DCL, in terms of the specific aspect of it I’m talking about here > and the ITS debugger/shell (DDT) ported to Unix... Do you have a link? One aspect of ITS I find fascinating is a debugged program can execute debugger commands. I actually implemented that before using a GDB Python script - have a do-nothing function passed a memory buffer containing a GDB command go run, the Python script sets a breakpoint on the function, and when that breakpoint is hit, it runs the GDB command, it can even write the results back into the buffer, and then it contin

There were a few alternatives, such as various versions of freevms, but also VMS userland on Linux. https://github.com/rroart/freevms

Actually someone did that: https://github.com/rroart/freevms

What about FreeVMS? https://github.com/rroart/freevms

Its a shame FreeVMS never took off: http://www.pvv.org/~roart/freevms.html https://github.com/rroart/freevms

A long, long time ago, there was a project called FreeVMS which aimed to do that. Sadly, it didn't get much further than booting. Edit: https://github.com/rroart/freevms . It's definitely not big and professional like OpenVMS :-)