The ECHO statement enables or disables echoing of keyboard input.
Keyboard input is normally echoed to the display when it is processed by an INPUT statement. Use of ECHO OFF will suppress this echo until a subsequent ECHO ON statement. Typically, ECHO OFF is used to prevent display of passwords, etc. Turning off echo does not suppress display of the input prompt character, if enabled (see PROMPT).
The ECHO expr format of this statement is equivalent to ECHO ON if the value of expr is non-zero and ECHO OFF if expr is zero.
DISPLAY "Enter password " :
This program fragment requests entry of a password with echoing inhibited. The HIDDEN option of the INPUT statement may be a better way to do this as it echoes asterisks back to the terminal.