idlwave-shell-show-commands is a variable defined in `idlw-shell.el'.
Its value is
(run misc breakpoint)
This variable may be risky if used as a file-local variable.
Documentation:
A list of command types to show output from in the shell.
Possibilities are 'run, 'debug, 'breakpoint, and 'misc. Unselected
types are not displayed in the shell. The type 'everything causes all
the copious shell traffic to be displayed.
You can customize this variable.