The echo command serves as a debugging aid, in that using echo on makes dip echo to the console everything sends to the serial device. This can be turned off again by calling echo off.
dip also allows you to leave script mode temporarily and enter terminal mode. In this mode, you can use dip just like any ordinary terminal program, writing to the serial line and reading from it. To leave this mode, enter Ctrl-].
Thu Mar 7 23:22:06 EST 1996