The debugger issues a prompt when it is ready for the next command from the terminal:
(idb) you type here
When you enter commands, you can use the left and right arrow keys to move within the line and the up and down arrow keys to recall previous commands for editing. When you finish entering a command, press the Enter key to submit the completed line to the debugger for processing.
Typically, you enter one debugger command on one command line. However, if a debugger command requires typing on multiple lines, type a backslash (\) character at the end of the line to be continued.
To re-execute the last valid command, press Enter without typing any characters.
Following are two very useful commands available in both modes:
(idb) help
(idb) quit