Questions tagged [tty]
A representation of a device that asynchronously transmits and receives serial data.
634 questions
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33 views
How to send input to process' STDIN from terminal without sending EOF?
I'm studying computer science and doing security exercises at https://ctf101.org/ and exploit exercises in my free time.
I want to send input to a program's STDIN (i.e. the payload below) in a format-...
0
votes
1answer
47 views
What is tty within Linux? [duplicate]
My understanding of tty is is that its means "teletype writers" from the older days, where people had to get teletype writers in order to receive and input data into virtual terminals, my questions ...
5
votes
1answer
94 views
+250
Run command in background with foreground terminal access
I am trying to create a function that can run an arbitrary command, interact with the child process (specifics omitted), and then wait for it to exit. If successful, typing run <command> will ...
0
votes
1answer
16 views
How secure is switching TTY sessions vs GNOME “Switch User”?
On my personal laptop I'm using Fedora 29 and have two user accounts for myself; let's call them "personal_admin" and "personal_user". My personal_admin account is strictly for administrative tasks (...
0
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0answers
53 views
How do I stop my terminal from clearing the command when I hit enter
I am using mintty under Cygwin on Windows 10. I don't know why this started happening but suddenly everytime I type a command and hit enter, the command and all the scrollback text is cleared. I don'...
0
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0answers
12 views
Create udev rules to run a shell script after insert an USB device
Actually, I have two lines of rules in my rules.d folder:
SUBSYSTEM=="tty", ATTRS{idVendor}=="23b8", ATTRS{idProduct}=="0005", SYMLINK+="ttyACM-Daruma", MODE="0777"
SUBSYSTEM=="tty", ATTRS{idVendor}==...
0
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0answers
52 views
flush tty device buffer from terminal
I have a serial device on /dev/ttyAMA0. I have program written in C that communicates with this device. But apart from the C program I sometimes need to input some configuration data from terminal, ...
-1
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0answers
32 views
USB CDC-ACM class throughput testing on Linux OS
I have a development HW where there are THREE ACM interfaces gets enumerated when connected to Ubuntu host. Interfaces are /dev/ttyACM0, /dev/ttyACM2, /dev/ttyACM3.
I would like to test the ...
1
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0answers
36 views
Problem with USB Driver VID and PID
I'm trying get data from an USB to my application. My device is a Power Frequency Inverter that have a Type B USB as output, in the another side have an USB type A plugged in the my computer.
When I ...
2
votes
2answers
61 views
Serial port program to write file/read to file from tty?
i'm looking for some commandline program which I can use to send and receive data to/from serial port. I would like to automate my testing process - start test script which will send file to ttyPC, ...
0
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0answers
53 views
Redirecting input bash
I have a program, that runs on only one Raspberry Pi, but could be run from multiple other computers (through SSH). When I run my program on the Pi, it runs as expected. To be able to run from crontab ...
0
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1answer
57 views
How to set VirtualBox VM to use wanted resolution without needing to edit bootloader config or passing kernel parameters
I want to test many of liveCD distributions in VirtualBox (specifically, want to test their installers). Some linux distributions use curses based installers (not X11). By default VM's window is ...
0
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2answers
107 views
How to restart KDE Plasma from tty?
Answers in this question only work if one can type the commands inside active KDE session. In another tty, kstart complains that it can't open display.
How to restart KDE from tty2?
How does kstart ...
0
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0answers
134 views
TTY Login hangs after username input with constant newline
Problem:
After a restart my Ubuntu Server 18.04 installation greets me as usual with the tty1 login prompt. The input of the username works as usual but after hitting enter the password prompt is ...
1
vote
0answers
43 views
Listen in to data read from file descriptor to ttyS
I have a serial device under /dev/ttyS0 and an application that is reading from the serial device (but not writing to it). I wanted to listen in to the data that is coming in on the serial device but ...
0
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0answers
303 views
Virtual terminal TTY always “hits enter” and does not let me type a password
When I change to a virtual terminal (e.g. tty3) by hitting Ctrl+Alt+F3 I can not log in.
After entering my username and hitting Enter the terminal somehow starts "virtually hitting enter". It just ...
0
votes
2answers
45 views
Text from standard input not visible after program exits from a readline
I am facing an issue where the text from my stdin is not visible from on my terminal. My program does the following
Sets a SIGALRM handler which exits a program when there is no input from the user ...
0
votes
1answer
345 views
Cannot open virtual console 7 (Permission Denied) when trying to start X on Gentoo
When I try to start X with i3 by typing startx /usr/bin/i3 I get the following error message:
(EE) xf86OpenConsole: Cannot open virtual console 7 (Permission denied)
Launching startx as root or ...
3
votes
2answers
129 views
To make a screenshot in console (without X)
My netbook have installed Debian linux without X.org. I need sometimes to make a screenshots-output of some scripts. I tried to use a framebuffer device for this purpose:
# cat /dev/fb0 > ...
2
votes
0answers
180 views
Can't access tty using Ctrl+Alt+F1,F2,F3 etc
Here is what I have tried:
$ xev
KeyRelease event, serial 43, synthetic NO, window 0x4a00001,
root 0x1db, subw 0x0, time 23449801, (434,-234), root:(1305,244),
state 0x1c, keycode 67 (keysym ...
2
votes
1answer
77 views
Why doesn't ctrl+u send SIGKILL? stty says it should
I can interrupt a program by pressing ctrl+c in the shell. Often this kills the program but some programs trap the signal and keep running.
I want to be able to kill such programs more aggressively ...
1
vote
1answer
57 views
Software for serial communications without speed limit
I have a serial to USB device which supports speeds of 8Mbaud and 12Mbaud (based on FT232H IC). I have tested it under Windows using HTerm, works just fine, but I had to resort to HTerm with hacked ...
1
vote
0answers
22 views
Reduce used display size for both X server and console
I have the situation that I have a LCD display that I would like to use but I want to have a "black unused frame" around the displayed content. Is there a kernel setting which controls the used ...
1
vote
0answers
43 views
Lock Virtual Terminals when resuming
Many screen lockers (mine is i3lock) do not block access to other Virtual Terminals. This means that, if I leave a session opened in some VT, then even when the desktop is locked (for example when ...
1
vote
0answers
509 views
Keep getting “standard in must be a tty” [closed]
I have searched on this error and have seen responses about requiretty adn visiblepw. I have verified and set using visudo that
Defaults !requiretty
is set. I have even commented out
Defaults !...
2
votes
0answers
180 views
Why do I not get a console with systemd?
I'm trying to get a login prompt on an embedded system using Debian and systemd. The system is connected via a physical serial console to a host PC. If I start the kernel with the cmdline parameters ...
4
votes
1answer
108 views
Is linux kernel implemented tty always render data using UTF-8?
It seems so. I read IUTF8, but the document only said it allows you to handle input as UTF-8 when doing line-editing.
But what about output? If you use a GUI Terminal, it usually allows you to ...
1
vote
0answers
167 views
PTY allocation request failed on channel 0
My remote vm server's password has expired, i cann't change password.
[user@localhost ~]$ ssh root@x.x.x.x
root@x.x.x.x's password:
PTY allocation request failed on channel 0
WARNING: Your password ...
0
votes
1answer
54 views
Linux switches to mysterious Kernel Buffer view everytime a new dmesg arrives
There is a mysterious tty that only reacts to sysrq, not to any other keyboard input.
It started after I engaged SysRQ+F and SysRq+i.
Every 30 seconds or so, Linux switches away from the current tty ...
0
votes
1answer
95 views
Calling stty from a systemd service
I have an expect script that I want to run at startup. Among other things it configures a few serial ports. When I run it via systemd I get:
couldn't read file "/dev/tty": no such device or address
...
2
votes
0answers
212 views
How to have local echo on with `screen` command?
I tried
screen /dev/ttyUSB1 9600,echo
but I still don't see what I type.
11
votes
2answers
2k views
What is `/dev/console` used for?
From this answer to Linux: Difference between /dev/console , /dev/tty and /dev/tty0
From the
documentation:
/dev/tty Current TTY device
/dev/console System console
/dev/tty0 Current ...
1
vote
1answer
92 views
Is `/dev/tty7` not directly accessible to Ubuntu users?
On Ubuntu, /dev/tty7 is the virtual console for desktop GUI.
Is the only way to access /dev/tty7 to use chvt 7 or Ctrl+Alt+F7?
Besides that, is /dev/tty7 not directly accessible to Ubuntu users, ...
0
votes
1answer
45 views
Is `/etc/tty0` in Ubuntu the file used by `init` and `getty`?
APUE says
The BSD terminal login procedure has not changed much over the past 35 years. The system administrator creates a file, usually /etc/ttys, that has one line per terminal
device. Each ...
3
votes
1answer
187 views
SSH to FreeBSD in UTF-8
I'm trying to ssh to FreeBSD-11.2-Release from my Windows machine using Mintty, but when I set LC_ALL to en_US.UTF-8 and try to enter/paste a non-ASCII character, connection got closed.
I'm using ...
2
votes
0answers
40 views
How to prevent switching to a different tty when Xserver starts?
I am working with tty2 because Linux terminates all processes every 30 seconds and Xserver refuses to start.
How can I keep tty2 in the foreground while the Xserver can go crazy in background?
1
vote
0answers
71 views
Make the TTY console ignore the /dev/input/event3 keyboard
I have a remote control IR USB receiver, but it acts just like a normal keyboard.
I'm reading the input from /dev/input/event3 to handle events. Because of this I need a way for the TTY console to ...
0
votes
0answers
31 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
36 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 ...
1
vote
2answers
68 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
74 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
48 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
139 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
74 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
1answer
38 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
64 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
97 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
1answer
91 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
225 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
63 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 ...
