How to display parameter values in LinuxCNC

How can I display the value of a named parameter or a number parameter like
#5400 
or
#<tool-in-spindle>

Is there any way I can get the whole error message when entering a  "MDI" command?
I get error messages in the bottom right corner of the Axis display, but they are chopped off.
 

Thanks,
Mike

This might help
forum.linuxcnc.org/38-general-linuxcnc-q...le-and-load-on-start
And the error messages are not chopped off, there is nothing more in them:
There are words in your gcode starting with E that the interpreter can not understand

Use brackets for debug: