Questions tagged [tty]
A representation of a device that asynchronously transmits and receives serial data.
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Unable to get terminal prompt when executing script via ssh
I have the below script that works fine when run locally
cat /tmp/input.sh
echo -n ">> "
read env
exit;
I get the command prompt when i ...
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why password is not asked when output is shown in another terminal
When i use:
date > /dev/tty3
the output is delivered to first cli terminal.
But my question is why does the terminal not ask for password.
We are using terminal for output, the command is ...
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3
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Running process in background ruins terminal
I have this makefile:
all:
sudo watch "ls -l" > /dev/null &
@echo line 1
@echo line 2
@echo line 3
@echo line 4
Running watch (or any other ...
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Can I open a tty program while inside another tty? Child vty process?
I'm busy creating an interactive 'tty' TUI program, and I'd now like to open another 'tty' program like less with it's interactive screen. If I try this normally, when starting a process a bunch of ...
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Where is the default VESA blanking mode in a Linux console tty set?
The Linux console tty implementation supports a "VESA blanking mode" option. This appears to define whether "console blanking" will actually standby/poweroff the monitor (...
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How to scroll back in Linux virtual consoles (2022)? [duplicate]
I'm only talking about the generic Linux virtual console, not terminal emulators such as GNOME Terminal or remote login interfaces like PuTTY.
It seems that some methods have been deprecated in newer ...
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I can't seem to get my serial ports working -- I get an input/output error. How do I fix this?
I'm working on a BeagleBone Black running 3.8.13-bone80. I'm trying to get UART2 working, but I can't seem to get it and I don't know the root of the problem.
I'd like to configure ttyS2 as such: stty ...
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BLFS - Black Screen after modprobe AMDGPU, but startx gives display
I have compiled Linux From Scratch, and enabled the amdgpu driver as a module from the linux kernel config. However, after the module is loaded, the graphics card initiates, then shows a black screen....
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How can I poll a serial for input?
So I have a device than transmits integers at a set frame-rate (10 fps or something). It connects via a usb cable to my linux machine (ubuntu 20.04) where it is recognized as ttyACM0. I can cat this ...
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Can you run a program before the TTY login shows up?
I want to execute cmatrix in my TTY for when I connect my Raspberry Pi to a monitor by default. I found a .service file here, and I'm wondering if it could work in my case.
Again, I just want cmatrix ...
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UDP to virtual serial port bi-directional bridge
I need to create a bi-directional UDP to virtual serial port bridge,
the serial port will be used in a C program trough an API that can only accept serial ports as its I/O stream.
I tought to use ...
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How to open a TTY session during startup and begin logging
Struggling to write a script that will open a TTY session during startup or shortly and continuously log.
Context:
I have an on small PC that is being deployed as an on prem syslog server running ...
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0
answers
15
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How to pass standard streams through a pseudo-terminal (in C)
Here is my contrived use case: write a C program that hooks into stdout and stderr in order to passively examine those text streams before sending them along to the console as usual. Each time the ...
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getty@tty1.service FAILED - Autologin only shows on TTY1 a flashing _
I'm working on a minecraft server with OS Ubuntu server 20.04
So far they haven't given me any problems (it's fantastic!), I know some things about linux (some don't exaggerate)
Until something came ...
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How to remap Ctrl to Caps Lock in a TTY?
I already understand how to remap keys in an X graphical server. However, I sometimes like to do work from a TTY and cannot seem to figure out a way to functionally remap Ctrl to Caps Lock.
I have ...
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72
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Logout of tty but save session for next login
5.18.9-arch1-1
Dell XPS 15 9510
I am running arch linux on xmonad. I do not have a login manager. On boot, I simply login via the tty and run startx to start my x session. This behavior is exactly ...
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Why does "w" still show ttyS1 when it was disconnected and the getty process was killed?
I connected a serial console with the command: sudo /sbin/gettey -L 115200 ttyS1 vt102 and it worked. Then I unplugged the cable on the port. Then I ran w and ttyS1 still showed:
minipc ttyS1 - ...
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How to configure two monitors, one for GUI, the other for console
My Linux machine have both HDMI and VGA ports working, which can connect to two different monitors respectively.
Is it possible to configure the Linux so that one monitor shows the normal GUI, while ...
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How can I disable the laptop keyboard in tty and then after a time turn it on again?
I have a kind of old ASUS Eee 1000HE PC and I replaced Windows 7 with Debian 32 Bit (PC is 32 bit).
And now I use it a lot because I always wanted Linux on a laptop
But I have one problem: some of the ...
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Get tty device paths for zte MF710M modem
i am trying to get the device paths for my modem zte MF710M using this script
#get all connected devices
usb-devices
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 21 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=...
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Why do X applications show a question mark as TTY in ps's result?
$ ps -ef | head -n 1 && ps -ef | grep calc
UID PID PPID C STIME TTY TIME CMD
user1 524014 5382 0 10:21 ? 00:00:01 gnome-calculator
user1 532125 510665 ...
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Vim colorscheme is not preserved within tmux on the linux TTY
There are a ton of questions about this on SO and on this site. See e.g. here or here.
However, basically all the solutions boil down to enabling some sort of 256 color compatibility in the user's ...
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True color support in TTY
I'd like to know if there's any way to get true color support in the tty. To be clear, I don't mean a terminal emulator, I mean the actual tty you get when no display server is running.
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Echoing to $(tty) in a backgrounded process
Why does this not print anything?
bash -c '(while echo "not printing" ; do sleep 1; done) > "$(tty)" & sleep 10'
Even though this, for example, does:
bash -c '(while echo &...
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4
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How to copy/paste between a console and an X session?
What's the fastest way to copy/paste between a non-graphical console (<Ctrl><Alt><F...>) and an X session ?
Right now :
I select the text with the mouse on the console (I've ...
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Checking the active virtual terminal on /dev/console using ioctl on Unix
I need to check when the /dev/console device has an active virtual terminal. On Linux I used this statement:
ioctl(fd, VT_GETSTATE, &vt_stat_struct);
active_terminal = vts.v_active;
However the ...
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Relationship between framebuffer and a tty
A framebuffer is a device file which allows for a simplified interface to the screen.
For example running the below code on a RaspberryPi with a HDMI display connected:
cat /dev/urandom > /dev/fb1
...
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How to get my brightness/volume and other special keys to work in a tty
I am running Debian stretch on a Lenovo laptop with only a window manager (i.e.
no desktop). Out of the box, this configuration of Debian ignores the keys with
special functions, such as volume up, ...
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1
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169
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Why dmesg output displayed on /dev/tty1
This is still related to my yesterday thread, so there's alert or maybe it's just log that displayed on my terminal on /dev/tty1. Ofcourse it's annoying because it's displayed in my bash prompt, so ...
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166
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why websocat or wscat in background with nohup, disown, bg, &, &! don't work
The question is about running a bash script in background with the ability to logout and the process to continue. The issue is that websocat and wscat don't like when I close the terminal or logout.......
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canonical/non-canonical vs raw/cooked?
In the context of terminals, what is the difference between the two opposites canonical/non-canonical and cooked/raw?
This thread says that they are synonym. But that's weird because one of the "...
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Linux : Force keyboard interface at boot time
I own a Razer Cynosa Chroma. At boot time, coherent with what lsusb -v would tell, linux-5.4.x enumerates 2 USB HID keyboard interfaces.
A/ on usb-0000:00:1d.2-2/input0
B/ on usb-0000:00:1d.2-2/input1
...
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How do I see what PID is accepting keys pressed
I'm currently troubleshooting media keys on my keyboard,
I've already confirms that the keys are working and definitely sending input to the OS, however this still does not send any input to media in ...
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101
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How can a process use a newly created pseudo-terminal if only root can open it?
I'm currently learning about the TTY system, and I want to create a demo application which opens /dev/pts/ptmx which will create a new terminal, and then have a process create a new session which will ...
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Virtual Consoles in Ubuntu
In This link is mentioned that Linux GUI is installed on tty7, but when I change my consoles using Ctrl+Alt+F1-F7 and check it by the command tty, I see that I have a GUI on my tty1 and tty2.
I'd like ...
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Running a script on every tty
I have a shell script that i want to run on every tty
echo "Hello!"
i tried adding it to my .bashrc but it only works after you login and it executes even if the terminal isnt a tty
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209
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Is /dev/ttyUSB0 a TTY?
I know the title of the question sounds a bit silly, but that's the best I could think of :)
As far as I understand, if I have some serial device connected with USB - let's say I connect my Arduino to ...
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F key doesn’t work in the tty
My “f” key doesn’t work in the tty. I already tried most of my other keys on the keyboard and all of them work fine, even symbols like Ü Ä Ö. The “f” works completely fine on the login screen and on ...
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2
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Open a terminal from an external device?
I'm currently learning about terminals, pseudo-terminals, etc. and I'm curious - today we all use the pseudo-terminals such as xterm or gnome-terminal that are part of the Linux GUI, and less often ...
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Linux login failed while username and password correct (tty interface)
Many times when I tried to log in Linux through tty. Although I've entered correct username and password. It showed "login failed" and didn't give more message. I checked the log.
/var/log# ...
user521639
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What's the best way to embed a terminal emulator into my (ncurses) app
Ideally, this would be in the form of a library that gives access to a buffer of characters to display and allows injecting characters and signals via an or character stream.
I am open to creating ...
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0
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36
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How to add cp437 support into Minicom?
I am using a Raspberry Pi (running Raspbian) to act as translator between SSH-over-Ethernet and an RS232 connection to a proprietary hardware box. This proprietary box seems to be using CP437 ...
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420
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Bash: echo command into tty
I've a service written in Python that can receive commands and does things, here is how it is built:
print("\nWelcome!\n")
for line in sys.stdin:
cmd=line.rstrip()
...
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/dev/ttyUSB0 is available but after try to call it's gone
If I connect my ESP32 to my Ubuntu ( 22.04 ) by USB it is available in /dev/ttyUSB0. If I run a call - for example sudo ampy --port /dev/ttyUSB0 ls the error message apears
Traceback (most recent call ...
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How change login prompt for headless Linux to ask for more than just username/password?
We want to setup a headless Linux box but have it force users to enter in more than just a username and password. Is there a way to add our own custom questions and then grab/verify the info entered ...
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201
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Why can fprintf(stderr, ....) output to screen when stderr doesn't refer to a terminal device?
Given that a simple program:
/* ttyname.c */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
int main(int argc, char **...
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How to monitor /dev/pts/X sessions?
I was trying to monitor some pts sessions I spawned using the Python pty module. Its a simple code like the following:
import pty
pty.spawn("/bin/bash")
I can see in the /dev/pts/ directory ...
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Why "No such device or address" when open /dev/tty in the first process?
Given that a simple program, as following:
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
int main(int argc, char **argv)
{
int fd = -1;
if (access("/dev/tty&...
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146
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How to write bytes to serial port's input buffer
I'm working on creating an emulator for a Captron button that is connected to a serial port /dev/ttyS0.
I'm trying to mimic the on-press action by writing a byte array to the serial port by printf /...
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How to check which "/dev/pty/x" file my putty session is using?
I opened quite a few putty sessions to my remote Ubuntu machine.
For each of the session, I got a /dev/pts/x file assigned to it. Like below:
crw--w---- 1 xxx tty 136, 0 Feb 5 23:08 0
crw--w---- 1 ...
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