Questions tagged [tty]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
24 views

When process writes to pseudoterminal slave, why it doesn't read what it wrote?

Here is my bash session: lrwx------ 1 stas stas 64 Mar 5 18:18 0 -> /dev/pts/0 lrwx------ 1 stas stas 64 Mar 5 18:18 1 -> /dev/pts/0 lrwx------ 1 stas stas 64 Mar 5 18:18 2 -> /dev/pts/0 ...
0
votes
0answers
82 views

pam_tty_audit collect only TTY events

I'm trying to put together a TTY logging feature under Ubuntu 18.04 server and created /etc/pam.d/tty-audit with the following content: session required pam_tty_audit.so enable=* and added that ...
5
votes
1answer
468 views

Need a replacement for “Snoopy”

Currently, we use Snoopy to monitor all commands issued by users on some externally accessible servers. We're in the process of updating everything to RHEL8 to ensure supportability and compliance, ...
0
votes
0answers
32 views

Parallel reads and writes to/from fifo gets blocked at openat()

I have some services which have to show their start/stop status to the pty, so I am doing the following: Store the invoking pty $(tty) Each background service will write out the message to a named-...
1
vote
0answers
55 views

Script command on alpine

I want to preserve colors of docker exec command. The only way I found is to use script command like so docker exec <container_name> script -q -c "./spiral migrate:status" /dev/null The ...
0
votes
1answer
142 views

Can many script instances write to tty (parallel)?

I have recently migrated my upstart scripts to systemd, unlike upstart, I don't see any output on the tty for services being started/stopped. To get that visual feedback, I added something like ...
0
votes
0answers
177 views

Fix or explain tty issue and gpg2

I'm having an issue importing or generating gpg secret keys on ubuntu 18.04 with my main (sudo) non-root user. With root user I have no problems with gpg, but non-root and it's basically permission ...
1
vote
1answer
545 views

How do I tell KVM to connect to a pfSense guest text terminal?

Intro I'm new to KVM. I'm preparing an instance of pfSense in KVM; running this gets me close but is not completely working: virt-install \ --name pfsense \ --os-variant freebsd11.2 \ --...
1
vote
1answer
342 views

Ubuntu Server 16.04 tty console is out of bounds

After booting there are leftovers of boot logs in the console. It is always a fixed number of lines. In console mode with the resolution of 640*480 it covers the whole screen leaving the console ...
24
votes
3answers
49k views

What does “the input device is not a TTY” exactly mean in “docker run” output?

This is a command that works: $ echo 'hi there' | docker run -i ubuntu cat hi there This is a command that responds with an error message: $ echo 'hi there' | docker run -it ubuntu cat the input ...
-2
votes
1answer
278 views

How can I chain a tty over multiple ssh hops [closed]

I have a target-server that is accessible by middle-server, and I want a terminal from my localhost to target-server, through middle-server. No need to open a port in my localhost.
3
votes
2answers
2k views

Unable to run Expect “ no more ptys. ” as normal user

I have an LXC container with CentOS 7.4 running. On running expect from Normal user I am getting the below error. user@server ~> expect -c "spawn ls" spawn ls The system has no more ptys. Ask ...
0
votes
1answer
86 views

ssh -N steals keystrokes

When I run an ssh session purely for tunnelling purposes, I start it like this: ssh -N -L 5432:localhost:5432 user@host & However, when I do so, about every second keystroke in the terminal ...
2
votes
2answers
547 views

Using pseudo tty with ssh and control master results in warning

I am setting up the following for some of my users. Machine A, running OpenSSH_6.6.1p1, OpenSSL 1.0.1e-fips Machine B, running OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.8, OpenSSL 1.0.1f Both servers are Linux,...
1
vote
2answers
3k views

How to tunnel the serial port from a remote machine?

I'm trying to access a remote serial console (a tty port on a remote machine) as if it's on a local machine. This is necessary for a serial-port only application to work on my machine. The remote tty ...
0
votes
2answers
260 views

Transfer binary files over /dev/pts

I am attempting to transfer a new Linux image, and corresponding files, between 2 boxes. Only my Controller has USB support containing my newly built kernel. I want to transfer the kernel from my ...
4
votes
2answers
2k views

How to silently broadcast a warning from a cronjob via “wall”?

So I have this cronjob on an Ubuntu 16.04 machine that ends in if ... echo "warning" | wall 2>&1 > /dev/null fi that I use to warn all users about some action taking place. Although I ...
0
votes
1answer
991 views

cant access tty:job control turned off After dist-upgrade [closed]

i cannot boot my server anymore what is the problem plz help
-2
votes
4answers
646 views

Connect two TTYs via TCP/IP

I have two computers running Debian and connected via Ethernet. They see each other. I need to connect two virtual terminals on this computer this way: anything I input in first terminal will be ...
0
votes
1answer
2k views

rsync: connection unexpectedly closed - No tty present

I'm having issues trying to rsync files over from a build server to a web server. the command im running is rsync -e "ssh -i ${HOME}/.ssh/id_rsa" --rsync-path="sudo rsync" -avh --chown=nobody:webdev ...
1
vote
1answer
776 views

SSH'ing with force pseudo-tty allocation doesn't print my MOTD

I know that -t option in ssh allocate pseudo-tty. I'm using -t to "jump" to different directory on login, something like this: ssh -t my-server "cd /path/to/my/directory; bash --login". Why if I log ...
1
vote
1answer
2k views

Cannot login to ssh - stdin: is not a tty

FIXED If you have seen this in the login screen of your server... stdin: is not a tty ...you know the trouble. Well. I've had the exact same problem on my root server. I tried several things to ...
4
votes
2answers
109 views

How to tell whether a serial connection is “established”?

We have a Debian-based embedded device. It runs an application that communicates with other embedded equipment via serial (RS-232, /dev/ttyS*). Usually, this works just fine. But of course, sometimes ...
1
vote
1answer
768 views

ssh command without tty hangs

I'm trying to execute a simple ssh remote command from my local machine to an AWS instance, by running: ssh -i /my/key.pem ec2-user@<myhost> 'ls -l' When I do this, the command returns with ...
0
votes
0answers
578 views

echo message not coming on terminal with systemd

I have systemd service, say xyzWarmup.service. Here is the service file [Unit] Description=Xyz agent. After=fooAfter.service Before=fooBefore1.service Before=fooBefore2.service [Service] # During ...
0
votes
2answers
2k views

No login prompt on tty[1-6] on Ubuntu 12.04.05

After disabling X on startup, no login ttys are offered on the console. I don't see any login prompt in any of the tty[1-6], just a line saying "* Starting Automounter [OK]" I have all the ...
1
vote
1answer
4k views

Chroot on Ubuntu 14.04.2 using Jailkit - /dev/pts No such file or directory

For the past few days I've been trying to setup a chroot on my Ubuntu server but I've been running into an issue. I've tried several different methods of setting up a chroot on Ubuntu including just ...
2
votes
0answers
507 views

Share serial port between linux containers

I have a requirement to share a single serial port between two or more linux containers. The LXCs are spawned by the host linux. I explored the option of socat, wherein the host will open a TCP ...
2
votes
2answers
8k views

how to disable serial console after successful boot (systemd/grub2)

I enable the serial console during the boot process on centos7 which uses grub2 and systemd (instead of inittab) I would like to undo that serial input/output at the very end of the boot, after a ...
0
votes
1answer
585 views

PAM tty auditing on CentOS 6.4

I am trying to implement pam tty auditing using http://jaredrobinson.com/blog/linux-tty-auditing/ but it is not working for me. Can some one tell me that any thing else apart from "session required ...
0
votes
2answers
197 views

Remote login terminal

I have an unusual request. I have a box - running Fedora 19 - that I'm using as a server. I have a crappy Atom netbook - also running Fedora - that isn't good for anything. I was wondering if there is ...
0
votes
3answers
167 views

tail -f AND allow text input

I want to create a script that allows some interactivity by tail -f logfile from myService allows text to be entered and sent to myService What I could not solve yet is this two functions working ...
1
vote
4answers
1k views

Fedora, ssh and sudo

I have to run a script remotely on several Fedora machines through ssh. Since the script requires root priviliges, I do: $ ssh me@remost_host "sudo touch test_sudo" #just a simple example sudo: no ...
77
votes
5answers
75k views

What is the benefit of not allocating a terminal in ssh?

Every once in a while I will do something like ssh user@host sudo thing and I am reminded that ssh doesn't allocate a pseudo-tty by default. Why doesn't it? What benefits would I be losing if I ...
0
votes
0answers
42 views

Debian as TCP-Server for Serial Port redirecting [duplicate]

I want to start a tcp listener on debian. One client should be able to connect and should get inputs of serial port in the tcp connection. And when the client sends data through the tcp socket the ...
1
vote
1answer
720 views

Recover a not responding ssh server [closed]

a machine with a postgres database (which is reponding fine) has a ssh service an nagios nrpe service. Responds to ping. Postgres is performing as expected. (apache connects from another host) ...
4
votes
1answer
803 views

ttylog attaches to the wrong process - release notes a bit hard to understand too

I have a lengthy python script running on a machine: [root@server1]# ps aux | grep python root 30640 15.6 0.6 296416 102444 pts/4 S+ 11:29 2:38 python my_script.py But I'm now working ...
0
votes
1answer
1k views

How to configure Ctrl+Alt+F1 to F6 to use with putty instances in Windows? [closed]

Is it possible to set up putty (or a fork), have multiple terminals/logins open while fullscreen, but each one with a single dedicated shortcut for switching to it? Just like Ctrl+Alt+F1 to F6 ...
31
votes
3answers
5k views

Did a cat /dev/urandom - Broken terminal

Out of curiosity, when your shell character set breaks from doing something like cat /dev/urandom is there a way to fix that in place?
2
votes
1answer
737 views

“sudo: no tty present” for munin plugin using password-less sudo

I am writing a plugin for munin to monitor something on our Ubuntu Linux server (which is on Amazon EC2). The plugin requires running a programme /usr/sbin/rabbitmqctl via sudo. I have the following ...
0
votes
3answers
1k views

How to watch other console without notification?

I want to see what is freelance admin doing to my server. But all solutions i have found - screen, conspy, vnc does't met my needs. Conspy is great but i have to ask free-lancer to run it first to ...
1
vote
1answer
46 views

script reading from new descriptor in read

I have a script that asks some questions to the user and repeats the question until the user has answered something appropiate. This is done with an infinite loop that is break'd when an acceptable ...
0
votes
2answers
828 views

Console Access — how does this work?

My dedicated provider did the following: wget S03HvTechAccess > /dev/null 2>&1 mv S03HvTechAccess /etc/rc3.d/ > /dev/null 2>&1 chmod 755 /etc/rc3.d/S03HvTechAccess > /dev/null ...
1
vote
1answer
478 views

kvm -monitor pty : how to find out the associated /dev/pts/#num

I have a server running multiple kvms. These are two to three vms so I consider libvirt somewhat oversized for management. And I'm completely comfortable with that setup. I actually just need the kvm ...
1
vote
1answer
591 views

lxc-console only works once

I have a debian-squeeze host-system on which I have installed lxc. i created a (squeeze) container, and started it. then I'm trying to get inside the container with lxc-console. everything works fine ...
1
vote
0answers
925 views

qemu/kvm: connect two machines via ttyS0

I would like to connect two machines via ttyS0 Here's what I did on the guest machines: A: Add to /etc/inittab: S0:2345:respawn:/sbin/mingetty ttyS0 Add to /etc/securetty: ttyS0 B: Try to ...
1
vote
1answer
764 views

Tell NetworkManager to ignore or not probe rfcomm0

I'm trying to remotely connect to a system via Bluetooth but am running into problems. Here's what I'm trying to do... On the remote device I'd like to have the following running: rfcomm -r watch 0 ...
-1
votes
1answer
1k views

Send input /dev/ttyUSB0 get the output [closed]

How can I send input to /dev/ttyUSB0 and get its output. I'm trying to do this in bash script. Any ideas?
1
vote
2answers
5k views

Remote SSH command via Java program

First of all my Linux knowledge is limited! I'm more a developer, who casually manages some servers :-) So, I'm operating on a farm of RHEL5/6 (mixed) servers and here is what I want to do: I have a ...
1
vote
1answer
1k views

How can I give tomcat sudo right [duplicate]

Possible Duplicate: No TTY present when running commands over SSH in here-document I installed tomcat7. It is nologin user tomcat7. That said, I need to give tomcat7 sudo rights to run other ...