Explode not anymore as a command?

I used to use the explode command by typing explode in the commands input, but in the last version the command is not being found. The only way is by pressing the explode button at the menu.
Is this just happening to me?

The join segments from polylines have never been executable from the command line either. I find that a problem. Command line is way more comfortable to use than buttons.

as far as I can see, the command for explode block/polyline is "modexplode", please try it.

Also, you can always check the list of supported commands just by pressing TAB in command line input (in Cmd widget)

Also, it's possible to specify aliases for commands, please check a file named librecad.alias.  

In the latest 2.2.2 alpha branch it is located in "Other Settings" directory path (from Application Preferences->Paths).  In previous ones - it should be in the application's data dir.

For joining segments of polyline - please try "plinejoin" command.

Yet in general yes, for some actions, support of controlling them via command line is a bit limited (mostly that's related to actions that requires a mouse-based user interactions, like entities selection or so).  

But if you see that some command is missing - please report it (ideally directly to GitHub tracker https://github.com/LibreCAD/LibreCAD/issues).

Hope this helps.