Questions tagged [tty]
A representation of a device that asynchronously transmits and receives serial data.
0
votes
0answers
24 views
Laptop without X/GUI: Make screen go blank when lid closes [duplicate]
I have a rather uncommon setup. I use laptops internally as some kind of server. The laptops are stacked in a rack and hence should not create an unnecessary amount of heat. So I'd like to shutdown ...
0
votes
0answers
18 views
What baud rate should I set when using screen tty for bluetooth?
I'm paired up with an Xbox Controller and want to see the output coming from the xbox controller in order to figure out its protocol.
I'm trying to do screen tty.Bluetooth-Incoming-Port 9600 on my ...
0
votes
1answer
23 views
Debian boots into terminal [on hold]
Last night I installed docker and docker-compose with apt in Debian 9 and it worked fine.
When I shut down my computer I was met with an authentication prompt (I had to type in my root password) ...
1
vote
2answers
36 views
What controls the mapping between Ctrl+Alt+F keys, TTYs and X sessions?
On my CentOS system, Ctrl+Alt+F1 shows the X Windows session known as :0, but on other systems Ctrl+Alt+F7 may do the same thing. What determines how Fn keys are mapped to X sessions and TTYs?
...
0
votes
1answer
53 views
How to prevent this service from starting at boot
This question is different from the possible candidate since here I am
asking how to remove the service at startup
I am using a Seeed ReSpeaker Core v2.0 board. I would like to use the UART ...
0
votes
1answer
24 views
UART to UART tcp/ip connection
Need to transmit and receive data(TCP/IP) between 2 raspberry through serial tx/rx pins (/ttyAMA0). Best way to do it? Better if this will be done from kernel space. Thanks!
1
vote
1answer
18 views
How do I use jpnevulator to capture and log the serial traffic between an application and hardware serial port?
OK, I've been googling for hours so I obviously have not been able to understand the answers to the various questions that have already been asked about this subject. I am hoping that, by asking the ...
2
votes
1answer
51 views
Audit file modifications over ssh in Linux
I wanted to monitor all the modifications made to file in Linux server
On some research I found audit tool which I have installed and configured using following commands
yum install audit # ...
0
votes
0answers
17 views
Run tmux without user process, to just provide its /dev/tty* – is this possible?
In Zsh I can do vared -t /dev/ttys002 ZSH_VERSION and use vared (variable-editor) on a foreign TTY (in this example on OS X /dev/ttys002). I already did this trick with Tmux, first obtaining the TTY ...
0
votes
1answer
28 views
Rip-off (an ncurses term) single bottom line out of /dev/tty terminal, is it possible?
Ncurses allows to separate a single line from screen, at level of physical screen (curscr), to devote it to e.g. a title bar, thus also creating a logical screen (stdscr), devoted to application's ...
1
vote
0answers
29 views
Udev rule for disabling usb serial driver [duplicate]
I have an ANT+ USB dongle, and some software I wrote, which uses libusb to communicate with the device.
On recent linux distributions (like Ubuntu 18.04) when I plug in the dongle, in my dmesg I see ...
0
votes
1answer
52 views
Linux ssh connection without pts
I'm connecting to my server using JSCH and I can't find the login user with the following commands :
who
w
I found that it's not connected as pts :
# netstat -tuplena | grep :22
...... 14918/...
0
votes
0answers
38 views
Sending commands to a USB modem: minicom works, but other tools don't
I am communicating (in a way that should be automated) with a (Quectel) USB modem that has the following interfaces available for AT commands: ttyACM0/3/4. On ACM0 everything just works. But on 3 and ...
0
votes
1answer
50 views
Does Linux kernel uses fonts from /usr/share/consolefonts? Is it safe for working kernel?
OS: Ubuntu 18.04. I think it is distribution-independent. The Arch Linux uses the same principle, but do it by another way.
I set the tty's font by editing the /etc/default/console-setup file:
...
-1
votes
1answer
52 views
How to resize TTY console width?
I'm on FreeBSD.
I want to set console width (just console, not ssh or telnet).
I used this command:
stty cols 132
Is this work for just console or worked for all of the connections (console, ssh ...
2
votes
1answer
46 views
Do pty devices have two input buffers?
When terminal devices are in cooked mode, bytes input into terminal is cached and processed by kernel, some bytes are used for line editting and "cosumed", making read return one line a time.
But for ...
0
votes
1answer
34 views
Running ibus with i3 on Ubuntu with multiple users
I have Ubuntu 18.04 running and I installed i3 as my display manager. In this Ubuntu version, it is nevertheless the default to have a GDM login screen. If I login into any account, Ubuntu starts that ...
0
votes
0answers
58 views
Logins and logouts history on linux
I am trying to look for the history of logins and logout on Unix systems: on Linux and OSX.
I found that there's the wtmp file which logs the history of the login and logouts. However, I am still ...
0
votes
0answers
40 views
Do the input queue and output queue belong to the terminal device, its driver, or line discipline?
In APUE, where should the input queue and output queue (shown in the first figure) appear in the second figure? For example,
in "actual device"
in "terminal device driver"
in "terminal line ...
0
votes
1answer
45 views
How to make `tty` work in .bash_profile
I have the following in my ~/.bash_profile in order to try to make GPG work nicely:
export GPG_TTY="`tty`"
But when I open a new shell, I get the following:
$ echo $GPG_TTY
not a tty
However, if ...
1
vote
1answer
59 views
Terminal output not displayed for certain commands
I'm having a weird problem on Ubuntu 18.04 (Desktop) where certain commands don't display output to the terminal when they are run when they definitely should. I can still capture the output of the ...
-1
votes
1answer
42 views
Send program's serial output to pseudo-terminal used by serial sniffer such as jpnevulator [duplicate]
I am running an application that communicates through a real serial port e.g. /dev/ttyS0 to a remote device. I can configure this application to use /dev/ttyS0, /dev/ttyS1, etc., by passing the ...
0
votes
1answer
19 views
Can I log user input and program output separately for a terminal session?
I wish I could make script work like this:
❯ script --user=call.log --prog=response.log
Script started
❯ echo foo
foo
❯ exit
Script done
❯ cat call.log
echo foo
❯ cat response.log
...
1
vote
2answers
45 views
Why application does not run from SCREEN without delay?
Suppose we need to run application in screen and keep it running when screen exits. The following command does the job, but only if "sleep 1" is appended to it. Why it does not work without "sleep 1"?
...
1
vote
1answer
49 views
Is this output from “who -a” normal?
This does not look normal to me:
who -a
system boot 2018-09-04 11:59
LOGIN tty1 2018-09-04 11:59 685 id=tty1
run-level 5 2018-09-04 11:59
user + pts/...
0
votes
1answer
206 views
tty1 missing login prompt
I have a clean Debian Stretch installation. It used to be the case that after booting I would end up on tty1 with a login prompt, and after logging X is started. I wanted to automate the logging in (...
0
votes
1answer
39 views
What causes xserver output to go blank when switching to tty console?
I am trying to run two monitors using two graphic cards. The first monitor is used for TTY, the second monitor is used to launch xserver.
When I launch xserver, I still have my other screen showing ...
0
votes
0answers
47 views
Specify tty numbers
As described here on can change the number of tty. However how can I configure it that I have only tty7,...,tty10 (and tty1 to tty6 are disabled)?
I usually use only tty7 upwards because pressing Ctr+...
2
votes
0answers
47 views
RS485: ioctl: ttyS1 not a tty device
I have a board with UART, and an external converter to RS485. It sits at /dev/ttyS1. The converter requires that I put the UART RTS pin to high when sending and to low when receiving. I can achieve ...
2
votes
2answers
63 views
Configure tty to prompt password for specific user
If I switch to a tty, say tty3, it asks me for a username and then for the corresponding password.
How can I achieve, that (only on tty3) it asks me just for a password for a pre-defined user name (...
1
vote
1answer
16 views
Thermal printer only print after send a second output data to tty port
I have a PCI Serial Card installed on a POS computer and I'm trying to install an old thermal printer in it. The test command ls > /dev/ttyS4 works well, but only after the second time I send it. For ...
0
votes
0answers
26 views
What obstacles are there to “move” a program to Tmux?
Suppose there is a program mc ran by bash in terminal iTerm. The /dev/tty is exposed by iTerm, the three file descriptors 0, 1, 2 are connected to that device (I know that Bash opens /dev/tty, while a ...
0
votes
0answers
32 views
How to use external monitor through HDMI without X / graphical environment?
I'm running Arch Linux on a laptop. I usually log in to the TTY console and only startx when I need to. I have an HDMI output and would like to use an external monitor. It works fine with xrandr but ...
1
vote
0answers
74 views
Why is root always logged in from ttyS0 (even after system reboot)? [closed]
I am continuously seeing root in the output of the w command on a virtual machine hosted on the cloud. I have restarted the machine several times and even tried sending CtrlAltDel from the OpenNebula ...
1
vote
0answers
72 views
Why does my serial port give a response without a loopback cable?
I'm new to using serial ports, and I have a loopback cable for serial on a Centos 7 machine. I have something in python that tests the port, but I've found that the program returns the expected ...
0
votes
0answers
16 views
Lightdm: Starting the Desktop Environment Depending on Which User Logged In
I'd like to set up a user account (lets call it userA) that, on login, instead of starting the desktop environment (Budgie), it goes to a TTY. Having the inverse behavior (starting at the TTY first ...
0
votes
0answers
43 views
Blank screen on raspberry pi on tty1
I have a raspberry pi 3 with a minimal version of Debian stretch installed. The serial output works fine, however, I can't get any output via HDMI. There is actually an HDMI output (monitor is having ...
0
votes
1answer
18 views
Software flow control: why TX is blocked on terminal?
Why terminal cannot send data after ^S was pressed?
I have always thought that ^S is used by terminal to tell tty driver that tty driver must not transmit data from application TO terminal (when it is ...
1
vote
2answers
53 views
How to give a tty a mode other than 640 and have it persist through reboot
I have an embedded device (Nvidia Jetson TX2 running Ubuntu 16.04) in a carrier board and need to use the serial port. The serial port on the carrier board maps to ttyS0 which by default is owned by ...
0
votes
1answer
56 views
How to restrict a user from using tty?
i was wondering if it is possible to force log out a user (anyone other than root) when trying to login via tty (ctrl+tab+f1/f2/f3..). The user should be able to use pts with no problems.
Using CentOS ...
-1
votes
1answer
67 views
Linux VT supports 8 colors but there are actual 16 distict ones. Why is so that?
According to Wiki's https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit article there are 8 "Standard colors" and 8 "High-intensity colors". When I checked terminal capability of the Linux' virtual ...
0
votes
0answers
60 views
Why does ssh allocate a tty on server side?
Basically when you run an interactive program on the server you need to use ssh -t instead of ssh. For example:
This works: ssh -t user@server top.
This doesn't work: ssh user@server top.
Question ...
0
votes
0answers
7 views
Unable to interact or switch tty's, but SysRQ+O and SysRQ+B works. What is that status?
A computer running Linux Mint 18.3 Sylvia 64-Bit on the MATE desktop hung up while I was absent for a few minutes, leaving tty3 open. The graphical desktop was only active on tty7.
Firefox, running ...
1
vote
1answer
45 views
How to remove sshd pts processes in status D without restarting servers
Why are these sshd-pts processes stuck in status D? It seems the system load averages are increasing due to these processes. How can I remove them without restarting my server.
(add ppid and etime)
[...
1
vote
0answers
27 views
PING token missed after un-successful Bulk OUT transfer
I'm trying to send a large amount of data(~15 Mb) from Host to Device over ttyACM3. I have used "cat" command for sending the data from host.
Host side: cat ./pattern.bin > /dev/ttyACM3
Device ...
2
votes
0answers
109 views
Data loss over ttyACM* when 'cat' command is used for data transfer
I have a development board which will have 3 ACM interfaces when connected to Ubuntu host and i want to transfer data from Host to Device over ttyACM3.
I have followed the following procedure for ...
0
votes
1answer
56 views
Determine if process was launched directly from a terminal window or programmatically as a child process
If a user runs a process from a terminal, is it possible to tell?
Compared to if the process was launch from a program, where that program was launched from a terminal.
The use case is if it's run by ...
6
votes
1answer
208 views
Keyboard shortcuts in the virtual terminal
Is there any way of configuring keyboard shortcuts in the Linux virtual console?
For example, if I go to tty1 then press the key combination Ctrl+Alt+H, I would like the script /usr/bin/hello.sh to ...
-1
votes
2answers
56 views
PC speaker beep and messy terminal font due to dd if=/dev/sda?
When running
sudo dd if=/dev/sda
the internal PC speaker makes sounds. Also all fonts, even the prompt and typing input has different characters such as "♡" or "•".
If you need to know more, ...
0
votes
1answer
253 views
Stuck at login loop while tty and recovery mode terminal works fine
I am having linux mint 18. I accidentally removed /bin/bash. So just after removing it I changed the default shell of the user from terminal (from /bin/bash to /bin/sh and /bin/sh links to dash) in /...
