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

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1answer
180 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
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2answers
5k 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, ...
1
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1answer
208 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 ...
0
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1answer
136 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 ...
45
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2answers
32k 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
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1answer
158 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
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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 ...
7
votes
1answer
263 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 ...
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2answers
500 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) ...
0
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1answer
397 views

How to change keyboard speed in the Linux console? [duplicate]

When I press Ctrl + Alt + F1 the desktop environment disappears and a terminal window appears. Pressing Ctrl + Alt + F7 brings me back to DE. This terminal is useful when the DE hangs for some reason ...
6
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2answers
3k views

Arch Linux how to close tty

I've opened several ttys and I don't know what key combination to use to close a tty. I'm using Arch Linux.
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3answers
619 views

Construct a command by putting a string into a tty

I managed to do this echo -n "command" > /dev/tty1 The letters appear, and the cursor moves, but they are "ghosts" - if you hit enter, nothing happens (they are not in stdin). Edit: In the ...
1
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1answer
401 views

Start IceWM from the command line *and* get sound working?

So, I hate window managers. I hate them all. My current distribution is Ubuntu 12.04. Here is my /etc/init/lightdm.conf: # LightDM - light Display Manager # # The display manager service manages ...
9
votes
1answer
11k views

Is it okay to disable requiretty?

I'm trying to set up a deploy script using Capistrano At a step cap deploy:setup script is connecting to my server and trying to run commands that create directories. Then I see an error: msudo: ...
1
vote
1answer
287 views

Can I use xterm to read/write to a pts without spawning another process (e.g a shell)?

I have a process which reads and writes to a pseudo terminal. I would like to open xterm and have it open a pseudo terminal and leave it open so I can communicate with this process without creating ...
6
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3answers
921 views

Create Null Modem Pair linux

I am looking to create virtual serial ports on Debian 6 squeeze. Basic requirements are: be able to connect as if port was a real serial port( IE be able to set baud, stop bits etc) com port pairs ...
3
votes
2answers
1k views

How to script /etc/issue?

I would like to pipe my tty number through figlet (ASCII generator) for the /etc/issue (message shown before login). Obviously this means I can't just update it from /etc/rc.local. On my system ...
3
votes
2answers
262 views

Hash symbol on a teletype

My issue is a bit unusual, so I want to provide a short background. I was looking at old winners of the International Obfucated C Code Contest, and came across an entry written for the PDP-11 (the ...
2
votes
0answers
109 views

Controlling ppp's chat buffering

I looked at the ppp chat source and it uses putchar to write to the device. When PPP is run over a line discipline like n_gsm, which multiplexes a tty via the GSM 07.10 protocol, a lot of extra data ...
2
votes
3answers
571 views

What's the difference between these ways of accessing the shell?

From what I know it seems that there are many ways to access the shell on Linux. So far the methods I know are: To use a program such as Terminal or Konsole To use the shortcuts CTRL + ALT + F1-6 To ...
2
votes
1answer
176 views

Does each user get his/her own tty(s)?

I put a simple echo command in a CLI tty by user1 expecting it to reach user2 who is logged in a separate tty. echo "Hello, world!" >> /dev/tty5 I expected user2 to get the echo message but ...
12
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1answer
847 views

Screenshot of X from tty

Using Xvfb I can launch an application and take a screenshot. What I'm wondering about is how to capture from an existing (dormant) X session. Say from tty or over ssh. From what I understand ...
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3answers
2k views

How to clear terminal after logging out?

Currently on my laptop when I log out I can still see traces of my last activities (in tty). How can I tell it (Gentoo) to clear the screen before logging out?
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0answers
163 views

Arch Linux not functional after kernel upate [duplicate]

Possible Duplicate: Arch Linux not booting after system update After running a system update, in which the kernel was updated, when I try to boot Arch (in single user, not quiet), I get the ...
3
votes
1answer
363 views

Preserve scroll on Linux console switch [duplicate]

Possible Duplicate: How do I ensure that a terminal remains scrollable? I've configured really sweet keystrokes for switching between, and scrolling in, a tty (the Linux console). But, as ...
3
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0answers
306 views

stty before login

We've got some HP-UX Integrity VMs that are difficult to log in to at the console because the KILL character is set to @, which also happens to be a component of some passwords. Now I know we can get ...
3
votes
2answers
314 views

why slight delay after failed login in tty [duplicate]

Possible Duplicate: Why a wrong password gives a big delay Whenever I mistype my password when logging in in a tty, I have noticed that I have to wait for a second before I'm able to log in ...
1
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1answer
359 views

Need help on setting up tty autologin on FreeBSD

I was trying to setup tty auto login for FreeBSD, I copied the P|Pc|Pc part and made a change: Pcal console:\ :al=root:ht:np:sp#9600 And modify the tty for ttyv0: ttyv0 "/usr/libexec/getty Pcal" ...
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votes
2answers
483 views

is it possible to run job in foreground after user logout

I have some job to run which need be attached to terminal (or in foreground). The job is run in remote servers, and needs keep running after the users logout. I am aware of vnc server, however, I want ...
4
votes
1answer
638 views

Disabling or changing console switching keys

For some reasons on my Ubuntu 11.04 Natty running Linux 2.6.38-13, with an Italian layout for the keyboard, the keystrokes AltFx switch between virtual consoles (instead of the normal CtrlAltFx ...
2
votes
1answer
188 views

Security drawbacks of disabling tty password check

I found that, in /etc/inittab, this modification (-a username) for the user u disables the login/password check for all tty:s: 1:2345:respawn:/sbin/getty -a u 38400 tty1 2:23:respawn:/sbin/getty -a u ...
1
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1answer
352 views

Graphics on boot like the backtrack linux or the Gentoo live DVD after you press alt+F1 on boot

Would like to find a good tutorial on how to make a boot splash similar to the one on backtrack {3,4,5}. It has all of the terminal text that you would see on a normal boot up but it has a nice ...
5
votes
1answer
2k views

Cannot switch to TTYs or back

I just upgraded to Mint 13 - KDE x64 I am unable to switch to ttys by using the CtrlAltF1 .. F6 keys. The gettys are running and I can switch to the terminals with the sudo chvt 1 command. I have ...
1
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1answer
229 views

Configuration for either detecting already running xsession or only auto-logging in once

My goal is an Arch based HTPC which on one tty runs XBMC and on another runs a minimalistic desktop (mainly for web browsing). I haven't yet started on the XBMC slice of the pie, but at the moment it ...
4
votes
3answers
3k views

cat corrupts serial port data

I have an application which writes some bytes to a serial port. When I do cat /dev/ttyS0 to see what is being transferred, I find that the data is corrupted by the cat command. Is there any other way ...
3
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2answers
433 views

Print console colors

Wrote a bash function to display the console colors. But, it seems some of the colors are not possible to show that way! (?) Also, note the strange "bright black"! (Note: The below screendump is of ...
12
votes
2answers
379 views

Possible to configure Login TTY over Audio device (Morse code or similar)?

One of the most miserable aspects of my day job is the need to occasionally investigate problems with machines scattered in remote locations all over the world that don't have network access to the ...
2
votes
1answer
101 views

Make 'CTRL-/' behave the same in vtty and xterm

When I press Ctrl+/ in a graphical terminal (e.g. xterm) I get "undo". However, in a virtual terminal (e.g. Ctrl+Alt+F1) I get "backspace". In practice I run into this when I'm using emacs in a ...
8
votes
2answers
2k views

Get ssh to forward signals

I want to be able to send signals (SIGINT is the most important) through ssh. This command: ssh server "sleep 1000;echo f" > foo will start sleep on server and after 1000 seconds it will put ...
1
vote
0answers
393 views

LMDE, Graphics with i915 and KMS: DVI not working on tty consoles

I already asked the same question at Super User, but I think it's better suited here, sorry: I have some problems getting the DVI output of my onboard Intel graphics device running when using KMS. ...
3
votes
0answers
77 views

any way to un-disown / re-attach an interactive process to the tty? [duplicate]

Possible Duplicate: How can I disown a running process and associate it to a new screen shell? In bash is there an opposite of disown, that is, to re-attach a process I've accidentally ...
3
votes
1answer
514 views

Low-level serial configuration?

I'm using embedded Linux platform, kernel is 2.6. I'm using stty command to configure ttyS* high level. The problem is that when I want to turn hardware flow control on: stty -F /dev/ttySA0 crtscts ...
3
votes
1answer
603 views

Is /sbin/sulogin safe?

Lately my machine's authentication system broke twice: once because I messed up with PAM/LDAP and the other one because I messed up with /etc/passwd or /etc/shadow. In order to recover things I had ...
4
votes
4answers
1k views

Graphics in TTY

Something has come up which demands me to work only in command line. My primary job is programming (mostly in Fortran and Octave) and I need to display plots. As a lame example: I open octave and ...
5
votes
1answer
463 views

Why does reading from two connected pty's cause an infinite loop?

I want to fake a gsm modem for testing a program. I want the program to send AT-codes to me and that I can answer it back, kind of a VirtualSerialPort. But for some reason the data written from the ...
4
votes
2answers
2k views

How to start plasma-desktop from SSH-console on desktop session?

I killed KDE's plasma-desktop on a openSUSE 11.2 machine, because it was eating too much CPU. How can I restart it via SSH or another tty session? On the affected computer there is only shown a ...
3
votes
3answers
613 views

Difference between the terminal file and the terminal screen

I recently posted a question about terminals and this seemed like it deserved its own question. If the tty which would be synonymous with terminal, is just the device driver/device file itself, what ...
5
votes
1answer
3k views

How can you get console backgrounds for Arch Linux?

I have tested out openSUSE and found that the tty1 is a bit different from other systems as the tty has got a background. I know that Knoppix has a tux penguin for each core the computer has, but I'm ...
3
votes
1answer
600 views

Outputting to the screen on an ARM Mini2440. Currently just has a login prompt

I have a mini2440 ARM computer with a small screen and currently have it booting Debian Squeeze. I'm communicating with it over a serial connection using minicom. When the thing boots it gives me a ...
4
votes
1answer
2k views

Writing to stdout except for output redirection C

I have to make a simple app for school. I have to write arguments one per line on the terminal, and return on stdout the user choices. For example, I write cat my_app main.c main.h, if the user ...