Trouble running sudo or (less ) after After making serial settings

[Ian Lepore]

On Wed, 2018-01-31 at 15:51 +0330, ali reza zareian wrote:
>  hello
> After making serial settings and boot using serial via putty, it is
> not
> possible to run sudo command.when i run this command without any
> parameters
> it should be print help but it is waiting for a key of the keyboard.
> if i send ctrl+c then output strings are printed.
> 
> Code:
> 
> settings :
> boot.config =>-S115200 -D
> ----------------------------------------------
> /etc/ttys =>ttyu0   "/usr/libexec/getty std.115200"
> vt100   onifconsole secure

Try changing std.115200 to 3wire.115200 to disable flow-control.  I
have no idea whether that's the problem, but it's a quick easy thing to
try.

-- Ian

> ----------------------------------------------
> echo $TERM => vt100
> ----------------------------------------------
> kern.vty=vt
> ----------------------------------------------
> ssty -a =>
> speed 115200 baud; 0 rows; 0 columns;
> lflags: icanon isig iexten echo echoe -echok echoke -echonl echoctl
>         -echoprt -altwerase -noflsh -tostop -flusho -pendin
> -nokerninfo
>         -extproc
> iflags: -istrip icrnl -inlcr -igncr ixon -ixoff ixany imaxbel -ignbrk
>         brkint -inpck -ignpar -parmrk
> oflags: opost onlcr -ocrnl tab3 -onocr -onlret
> cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts
> -dsrflow
>         -dtrflow -mdmbuf
> cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
>         eol2 = <undef>; erase = ^?; erase2 = ^H; intr = ^C; kill =
> ^U;
>         lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q;
>         status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;
> ---------------------------------------------------
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