A representation of a device that asynchronously transmits and receives serial data.

learn more… | top users | synonyms

3
votes
4answers
384 views

How do you find what keys the “erase” and “line-kill” characters are in Ubuntu?

I'm new to Unix and have bought today a copy of "The Unix Programming Environment". I'm trying out the stuff from the book. But some of them are not working as expected like : To kill a line and ...
2
votes
1answer
405 views

accessing stdin/stdout of a process started in another tty

I logged in to my linux physically(say tty1) and started a process that watches stdin for commands and has some stdout-put. How can I access/use this process from a SSH session?
5
votes
1answer
1k views

Return to X session after Ctrl+Alt+F1

What is the command to return to the graphical desktop after entering the terminal mode with Ctrl+Alt+F1? I need it for operating my Raspbian.
3
votes
0answers
120 views

No Login on created on tty2 to 6

On my Debian Linux no Login is possible on terminals 2 to 6. Login on 1 works fine, xorg-session with XDM and awesome wm works, too. The Error Message shown on these 5 screens is: ...
0
votes
1answer
193 views

Making a tty9 on a openvz VE

I am in a virtual environment. I am installing Asterisk and freepbx. They use this script amportal and it has a requirement to check for tty9 there is alot of mention on folks running this in a VE ...
4
votes
1answer
168 views

Use case of providing file-like API to terminal/console

It was explained in this Stack Overflow thread that each logical terminal has a "pseudo-terminal", and that writing to one: $ cat some-file.txt > /dev/ttys002 will cause the data to appear in ...
2
votes
1answer
127 views

How to restore from a scrambled screen?

My screen is scrambled while reading some unexpected chars, It happens in a local tty, so logging out won't help. Any ideas? Hopefully I don't have to reboot
2
votes
1answer
186 views

Why does `last` show '{' and '|' in the TTY field?

We recently set up a new FreeBSD 7.2 machine on March 11. When looking at last, we noticed some funny characters for the TTY field. What do these characters mean? Note that at this time, the ...
2
votes
2answers
8k views

How to set default console keyboard layout in Arch Linux?

Whenever I reboot my computer I have to set the keyboard layout in a console again with loadkeys. Is there a way to change the default keyboard layout that is loaded everytime the computer boots?
10
votes
2answers
230 views

Is there a way to mirror USB outputs?

I'm currently writing a program for a project. It is for a braille reading system where I have a braille display connected via USB that is controlled by a program called brltty. One of the ...
5
votes
2answers
1k views

Best way to set serial port speeds on boot?

I've got instruments hooked up to /dev/ttyS1 through ttyS9 on a machine running Debian Wheezy. The various instruments communicate at various speeds. Is there a better way to set the baud rates than ...
3
votes
1answer
1k views

sudo askpass: ask from other tty

Context I want to setup rsync backups of my server, so I run the following command rsync -r -e ssh --rsync-path="sudo rsync" rsyncuser@example.com:/ /backup/ Ideally, that command would ask my ...
2
votes
1answer
551 views

Debian chroot blocking PTTYs on host

I've created a Debian-based chroot environment using debootstrap under Arch Linux, and fill it with life like this: #!/bin/sh mount -t proc proc $CHROOT/proc mount -t devpts devpts $CHROOT/dev/pts ...
2
votes
0answers
192 views

FreeBSD gettytab configuration

I have a serial port on my system which is named cuau3 under FreeBSD. I want to change the properties of this port, I can change the device's speed using /etc/ttys and /etc/gettytab files, but I can't ...
1
vote
0answers
39 views

How to get 256 color support in a login shell TTY? [duplicate]

I want to experiment with a fully text-based environment, however, the only thing that is stopping me - is getting 256 colors so my Vim color schemes could work perfectly. When I enter a TTY by ...
2
votes
2answers
176 views

Take copy of TTY0 text

I have some output in TTY1 that I think might hold clues as to why my last GUI session froze (CtrlAltBackspace was able to get me back to the terminal and I reloaded the GUI). However, I cannot seem ...
3
votes
1answer
1k views

No room on ep ring?

I just switched to tty1, and I'm getting all kinds of output. It all looks like this: [timestamp] xhci_hcd 0000:00:14.0: ERROR no room on ep ring It's happening over 100 times per second, every 5 ...
4
votes
1answer
8k views

Change the number of rows and columns in the TTY [duplicate]

I want to resize the terminal which comes up when you press CtrlAltF1 (or F2,F3,...). 25x80 is small for a 24" screen. Tried using stty, but the commands stty columns 200 and stty rows 50 does not ...
0
votes
0answers
86 views

Root has no permission on virtual console screen devices

Even being root I can't do the following: # cat /dev/vcs1 cat: /dev/vcs1: Operation not permitted And the rights are set correctly: # ls -o /dev/ crw-r--r-- 1 root 7, 1 Aug 5 22:00 vcs1 ...
1
vote
1answer
47 views

Cannot figure out how to revert back to backed up profile file

Basically, I made a backup copy of my /etc/profile (or ~/.profile I can't remember exactly) file that executes as soon as you login to a TTY, and then I changed the one that was there, and now it ...
1
vote
1answer
1k views

How to disable respawn for terminal?

In old 5.3 rhel, we used to define the number of terminals and their respawn settings in /etc/inittab file as below. 1:2345:respawn:/sbin/mingetty tty1 1:2345:respawn:/sbin/mingetty tty2 ...
7
votes
1answer
1k views

In which cases is SIGHUP not sent to a job when you log out?

I read an answer from a user who claimed that running foo 2>&1 >& output.log & would result in foo continuing to run even when they log out. According to this user, this even ...
0
votes
1answer
299 views

Black screen TTYs1-6 (KDE)

Since I installed KDE and removed Gnome, when I switch to any TTY1-6 I got a black screen. Switching back to TTY7 works fine. I don't know why is this happening, but I guess that some needed package ...
6
votes
2answers
666 views

My process was killed but I cannot understand the kernel notice

I have a custom application running on an embedded x86 setup (built using buildroot and uClibc). The application has been running fine but this morning when I returned to work I discovered my process ...
2
votes
1answer
680 views

Start remote X session on local tty

I have access to two Linux boxes, both running X servers. Let's call them A and B. I do not always have physical access to machine A, though I can always access it remotely and I have admin access to ...
8
votes
3answers
4k views

Why does awk do full buffering when reading from a pipe

I'm reading from a serial port connected to a gps device sending nmea strings. A simplified invocation to illustrate my point: $ awk '{ print $0 }' /dev/ttyPSC9 ...
3
votes
1answer
434 views

Relationship among runlevels and virtual terminals (TTY)

When I switch from rulevel 5 to 3 (with init command) and I press CtrlAltF1 up to F7, I realize that now I’m on TTY1 instead of TTY7 and when I switch back to runlevel 5 I return back to TTY7. Why? ...
5
votes
2answers
2k views

Why are there so many virtual terminal devices?

I've been reading the Advanced Linux Programming book and it mentions about virtual terminals which, if I understood it correctly, it is a Linux-specific feature (not in Unix) to allow multiple login ...
0
votes
1answer
1k views

How can I set the TTY font size manually in Lubuntu? [duplicate]

I'm configuring some minimal Lubuntu installs, which will run within VMs. They do not have window managers, and I do not intend to install any. I would like to increase the TTY font size so that 4 of ...
0
votes
1answer
261 views

After upgrading to linux kernel 3.9, kde does not start correctly

I recently upgrade my debian from kernel 3.2 to 3.9. This leads to a strange problem. After booting to kernel 3.9, it directly goes to tty7 instead of kde login. I can identify that kdm is up and ...
2
votes
1answer
1k views

Getting no tty present and no askpass program specified when using git over ssh

I'm trying to push a git commit from my laptop to my server but keep getting the following error message: remote: sudo: no tty present and no askpass program specified To ...
3
votes
2answers
2k views

udev re-numbering when creating symlinks

I have USB cellular modem attached to an ALIX 3d2 board running voyage linux (which is based on Debian Squeeze). The modem registers itself as a TTY device, and so by default, udev will create TTY ...
0
votes
0answers
399 views

Ubuntu cannot start from terminal

Ubuntu 12.04 By a mistake, I stopped lightdm. Then switched to tty1, and rebooted. Now, After startup, It just came a black screen with a cursor, can type nothing. I tried Ctrl+F1 to F12 (and ...
1
vote
2answers
180 views

/dev/console points to tty0?

I've been trying to understand the /dev/console device, but there are a few things I'm not clear on: What is the purpose of this device? From what I can gather it's just a place for the kernel to ...
1
vote
1answer
414 views

Creating a terminal device for interprocess communication

I'd like to know how to create a terminal device to simulate a piece of hardware connected through a serial port. Basically, tty device with a certain baud rate that can be read from and written to ...
7
votes
1answer
274 views

“w | tail” chops text at right margin (78 characters)

Summary: w | tail chops rows after 78th column. When I run the "w" command, it works as expected. However, when I pipe the output to "tail", it chops the output to 78 columns wide (truncates anything ...
4
votes
1answer
153 views

Can I access X11's clipboard from tty1-6?

Sometimes, when I'm running on battery and don't need a window manager, I'll log into tty1, fire up fbterm and Vim and work. Later, if I need the window manager, I'll use the log in GUI but switch ...
3
votes
2answers
162 views

Reading from a serial interface

I have a serial device running which I need to read data from(I have absolutely no control over the device itself) except reading its output; using hyper terminal in Windows I am able to detect a ...
35
votes
2answers
3k views

Can a terminal emulator be as fast as TTY 1-6?

I've been trying various terminal emulators lately, from the built-in gnome-terminal, aterm, xterm, wterm, to rxvt. The test I've been doing is in this order: Open up a tmux window with 2 panes The ...
0
votes
2answers
43 views

How to launch a program in text only mode if it support silent running

I have got a java program, which support text file input and auto running, can i put it in background running without GUI ? It prompt cannot set display. while there is no concern to view the ...
8
votes
1answer
2k views

How do I use a font in .ttc format as the console font?

I rather dislike the available tty fonts and would rather use Menlo, which is what I use in OS X's Terminal. Menlo is in a .ttc format, but (from the contents of /usr/share/consolefonts) Linux seems ...
1
vote
1answer
218 views

How to disable messages in unix if mesg and chgrp not allowed?

This is one of my questions for my exam .. We are not supposed to use mesg y/n for this but we should effectively avoid mesgs along with the problem of not being able to change groups.
10
votes
2answers
7k views

set baud speed for tty

How do I set the baud speed for a specific tty (in this case a serial port)? I tried using stty -F /dev/tty.iap ispeed 19200 But get the error Invalid argument for every speed I try (2400, 4800, ...
2
votes
1answer
243 views

What are TTYs >12 used for?

Related to TTY numbers, it looks like there are 64 TTYs (find /dev -name 'tty[0-9]*' | cut -c 9- | sort -n | tail -n 1 and documentation). tty0 is the current virtual console, Ctrl+Meta+F1 reports ...
1
vote
1answer
160 views

What are the different virtual TTY numbers used for?

It seems by default (at least on Ubuntu, but I think I saw the same on other distros) there are virtual TTYs 1-6 for text login, 7 for GUI login, and 8 upwards are unused or at least non-interactive ...
53
votes
2answers
40k views

Linux: Difference between /dev/console , /dev/tty and /dev/tty0

On a Linux system, what is the difference between /dev/console , /dev/tty and /dev/tty0 ? What is their respective use? How do they compare?
2
votes
1answer
211 views

How to rebind XON/XOFF keys?

I put stty -ixon -ixoff in my .bashrc so I can use Control+S to search the bash history forward (here there is a text about it). However, I sometimes used Control+S to really send the XOFF signal to ...
9
votes
2answers
2k views

Rebinding/disabling CTRL+ALT+F#

I have an application that binds CTRL+ALT+F7, but my linux machine seems to catch the keystroke. Is there a way to rebind/disable this key? A recompile of the kernel is an acceptable answer. The ...
8
votes
1answer
342 views

What should interactive shells do in orphaned process groups?

(Re-posting in unix per the suggestion in http://stackoverflow.com/questions/13718394/what-should-interactive-shells-do-in-orphaned-process-groups) The short question is, what should a shell do if it ...
1
vote
2answers
673 views

Invoke a command/script disconnected from the controlling terminal?

I'm investigating the behaviour of a script that is normally run as an automated process (e.g. cron, Jenkins). The script can (eventually) invoke commands that behave differently (seeking user input) ...