Most UNIX terminals are not capable of detecting the Alt, Ctrl and a number of other keys (such as Shift) when they are pressed alone. Therefore, an alternative is provided. Enter /a to simulate the depression or release of the Alt key. Enter /c to simulate the depression or release of the Ctrl key.
To use the forward slash character, enter it twice: //. To get help on these and other keyboard mappings, enter /m. See UNIX Key Usage Chart for a list of keystroke mappings.