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    Change and print terminal line settings

        # calling the script directly [setting...] {-a,-g,-v,--version}
        # Calling Stty module
        use IO::Stty;
        IO::Stty::stty(\*TTYHANDLE, @modes);

         use IO::Stty;

         # Turn off echoing.

         # Do whatever.. grab input maybe?
         $read_password = <>;

         # Now restore the old mode.

         # What settings do we have anyway?
         print IO::Stty::stty(\*STDIN,'-a');

    This is the PERL POSIX compliant stty.

    This has not been tailored to the IO::File stuff but will work with it
    as indicated. Before you go futzing with term parameters it's a good
    idea to grab the current settings and restore them when you finish.

    stty accepts the following non-option arguments that change aspects of
    the terminal line operation. A `[-]' before a capability means that it
    can be turned off by preceding it with a `-'.

stty parameters
  Control settings
        Generate parity bit in output and expect parity bit in input.

        Set odd parity (even with `-').

    cs5 cs6 cs7 cs8
        Set character size to 5, 6, 7, or 8 bits.

    [-]hupcl [-]hup
        Send a hangup signal when the last process closes the tty.

        Use two stop bits per character (one with `-').

        Allow input to be received.

        Disable modem control signals.

  Input settings
        Ignore break characters.

        Breaks cause an interrupt signal.

        Ignore characters with parity errors.

        Mark parity errors (with a 255-0-character sequence).

        Enable input parity checking.

        Clear high (8th) bit of input characters.

        Translate newline to carriage return.

        Ignore carriage return.

        Translate carriage return to newline.

        Enable XON/XOFF flow control.

        Enable sending of stop character when the system input buffer is
        almost full, and start character when it becomes almost empty again.

  Output settings
        Postprocess output.

  Local settings
        Enable interrupt, quit, and suspend special characters.

        Enable erase, kill, werase, and rprnt special characters.

        Echo input characters.

    [-]echoe, [-]crterase
        Echo erase characters as backspace-space-backspace.

        Echo a newline after a kill character.

        Echo newline even if not echoing other characters.

        Disable flushing after interrupt and quit special characters.

        * Though this claims non-posixhood it is supported by the perl

    [-]tostop (np)
        Stop background jobs that try to write to the terminal.

  Combination settings
    ek  Reset the erase and kill special characters to their default values.

        Same as:

            cread -ignbrk brkint -inlcr -igncr icrnl -ixoff opost 
            isig icanon echo echoe echok -echonl -noflsh -tostop

        also sets all special characters to their default values.

        Same as:

            brkint ignpar istrip icrnl ixon opost isig icanon

        plus sets the eof and eol characters to their default values if they
        are the same as the min and time characters. With `-', same as raw.

        Same as:

            -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr
            -icrnl -ixon -ixoff -opost -isig -icanon min 1 time 0

        With `-', same as cooked.

        Same as:

            -parenb -istrip cs8

        With `-', same as parenb istrip cs7.

    dec Same as:

            echoe echoctl echoke -ixany

        Also sets the interrupt special character to Ctrl-C, erase to Del,
        and kill to Ctrl-U.

  Special characters
    The special characters' default values vary from system to system. They
    are set with the syntax `name value', where the names are listed below
    and the value can be given either literally, in hat notation (`^c'), or
    as an integer which may start with `0x' to indicate hexadecimal, `0' to
    indicate octal, or any other digit to indicate decimal. Giving a value
    of `^-' or `undef' disables that special character.

        Send an interrupt signal.

        Send a quit signal.

        Erase the last character typed.

        Erase the current line.

    eof Send an end of file (terminate the input).

    eol End the line.

        Restart the output after stopping it.

        Stop the output.

        Send a terminal stop signal.

  Special settings
    min N
        Set the minimum number of characters that will satisfy a read until
        the time value has expired, when <E>-icanon<E> is set.

    time N
        Set the number of tenths of a second before reads time out if the
        min number of characters have not been read, when -icanon is set.

    N   Set the input and output speeds to N. N can be one of: 0 50 75 110
        134 134.5 150 200 300 600 1200 1800 2400 4800 9600 19200 38400 exta
        extb. exta is the same as 19200; extb is the same as 38400. 0 hangs
        up the line if -clocal is set.

    -a  Print all current settings in human-readable form.

    -g  Print all current settings in a form that can be used as an argument
        to another stty command to restore the current settings.

        Print version info.

Direct Subroutines
            IO::Stty::stty(\*STDIN, @params);

        From comments:

            I'm not feeling very inspired about this. Terminal parameters are obscure
            and boring. Basically what this will do is get the current setting,
            take the parameters, modify the setting and write it back. Zzzz.
            This is not especially efficent and probably not too fast. Assuming the POSIX
            spec has been implemented properly it should mostly work.

        Needs documentation

    Austin Schutz <> (Initial version and maintenance)

    Todd Rinaldo <> (Maintenance)

    This is use at your own risk software. Do anything you want with it
    except blame me for it blowing up your machine because it's full of

    See above for what functions are supported. It's mostly standard POSIX
    stuff. If any of the settings are wrong and you actually know what some
    of these extremely arcane settings (like what 'sane' should be in POSIX
    land) really should be, please open an RT ticket.


    Copyright 1997 Austin Schutz, all rights reserved.

    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.