gdc signal Send a signal to the running process. step Execute the next source line, stepping into a function if necessary. undisplay Reverse the effect of the display command; keep expressions from being displayed. until Finish the current loop. up Move up one stack frame to make another function the current one. watch Set a watchpoint (i.e., a data breakpoint) in the program. whatis Print the type of a variable or function. gdc gdc [options] command Description