Enables/disables terminal echo.
Curses Library (libcurses.a)
The echo subroutine enables Echo mode for the current screen. The noecho subroutine disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo and noecho subroutines control software echo only. Hardware echo must remain disabled for the duration of the application, else the behaviour is undefined.
Upon successful completion, these subroutines return OK. Otherwise, they return ERR.
These subroutines are part of Base Operating System (BOS) Runtime.
The wgetch subroutine
Curses Overview for Programming in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.
List of Curses Subroutines and Understanding Terminals with Curses in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.