Terminal echoing is generally handled directly by the shell. Therefore, there is no direct way in perl to turn echoing on and off. However, you can call the command "stty [-]echo". The following will allow you to accept input without it being echoed to the screen, for example as a way to accept passwords (error checking deleted for brevity):
print "Please enter your password: ''; system("stty -echo"); chop($password=
); print "\n"; system("stty echo");
Again, under perl 5, you can use Curses and call &Curses::noecho() and &Curses::echo() to turn echoing off and on. Or, there's always the ReadKey extension.
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