SSH (Secure SHell) is a protocol for running commands on a remote computer.

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5
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1answer
2k views

Is my default remote shell a trouble maker?

By finger tim on the server, I learned that my default shell is some script /usr/local/bin/bash-wrapper whose content is: #!/bin/bash USERNAME=`whoami` if ! grep ^$USERNAME$ /etc/domain-users > /...
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votes
3answers
4k views

SSH login as root fails, but I'm sure I entered the right password

What am I missing? I change the root password on a unix machine, then try to log in with that password. PasswordAuthentication is set to yes in sshd_config and the sshd daemon has been restarted. ...
5
votes
5answers
2k views

Multiple ssh sessions in single command

I'm trying to copy a database from one server to another. I tried using the following command and it's getting tied up on entering the ssh passwords. If I put in one server's password, it complains ...
5
votes
1answer
4k views

notify-send not working under ssh

Maybe this is answered somewhere else, but I didn't see it. I am running Ubuntu 14.04. When I SSH into my machine, for example: ssh <user>@<machineip> notify-send "Hello" I don't see ...
4
votes
1answer
3k views

How to print from remote over SSH to local LAN printer?

OK, so it is fairly straight forward to to run apps from a remote server on my local X screen as though they were local apps. The question is, when trying to print, the remote app only sees printers ...
4
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3answers
8k views

How can I scp a file that my user can't read but I can sudo?

Can I use scp to copy a file from a remote server which my login user can't read, but where I have permission to sudo to root (without password even)? How?
4
votes
1answer
4k views

ssh into an account which has no home directory

As a follow up to my previous question, I have decided to create the local user accounts as below. adduser --system --no-create-home USERNAME Now, I would like the local users to be able to access ...
3
votes
1answer
125 views

ssh public key auth: first login still asks for a password

I have set up public key authentication with ssh, but what happens, is that when I first log in, it still asks for a password, any subsequent login (while keeping the first login alive), does not ask ...
3
votes
1answer
3k views

User logged in by sftp does not show up in `w`

My server is Centos 5. I have a chroot environment set up with the following in my sshd_config Match group sftponly ForceCommand internal-sftp ChrootDirectory %h AllowTcpForwarding no ...
3
votes
3answers
16k views

change shell in Solaris/SunOS for your user only wihtout access to /etc/passwd

How do I set the shell in Solaris/SunOS for my user only, without access to /etc/passwd or any other su stuff? It should thereafter work both for interactive ssh (1) and ssh when you send commands (2)...
2
votes
1answer
24k views

How do I execute a remote shell script over SSH and be prompted for passwords by commands that require it in that script?

I want to do something like this ssh user@remote-domain.com ./remote_script.sh Contents of remote_script.sh #!/bin/bash hg pull This example is much simpler than what I am actually doing. I know ...
2
votes
1answer
362 views

How to put a tunnel in a tunnel?

I know I can create an ssh tunnel and then tell a program (with tsocks) to use it for networking. But. How can I put an ssh tunnel in an ssh tunnel? I mean I can't again use the tsocks in tsocks ...
2
votes
3answers
162 views

Can I bridge “backwards” from an ssh connection to my local emacs-server?

I'd very much like to log in to a remote machine with ssh and via the $EDITOR environment variable (or something similar) be able to edit in my local Emacs. In this case, specifically for when I log ...
1
vote
2answers
107 views

Passing variable definitions to specific shells in ssh

I would like to ssh to a machine with a pre-defined setting, specifically in zsh. To do so, I have tried doing the following from the client (inspired by this answer): $ ssh -t machine@domain "...
1
vote
2answers
2k views

ssh + nohup does not work

I'm trying to run a program over SSH that keeps running when I disconnect. This Stack Overflow answer gave me the following command: nohup sleep 30 > foo.out 2> foo.err < /dev/null & ...
1
vote
1answer
68 views

Correct ssh config file settings to tunnel to a 3rd machine

I'm trying to tunnel to and end server via a bridge server. So far, I've been able to get it working from the command shell properly using the following command: ssh -A -t bridge_userid@...
1
vote
2answers
999 views

Shell Script - how to scp into remote server and download files and protect password

I have a remote server that I need to download Apache logs from. I can manually scp into the server and get the files, but I'd like to put this in crontab. The only way to automate it is to include ...
1
vote
1answer
149 views

osx server, windows client, running emacs opens it on server not client

I've installed emacsformacosx on my OSX box. I'd like to shove my macmini in a data center and run it headless. I've gotten x-windows working. If I run xeyes, it displays on my Windows 7 client. ...
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vote
2answers
1k views

How to change user with authentication inside shell script

It is possible to change the user within a shell script by su - newuser; but what if the newuser needs authentication. How can I provide the password within the shell script? None of the users is ...
1
vote
3answers
8k views

Using nohup to keep a script running indefinitely

I am very new to Linux and I've only been using it to SSH to my web server using Putty. The issue I am having is this: Basically I've got 2 php scripts. One get_tweets.php constantly listens for ...
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vote
2answers
595 views

How do you keep the password hidden when invoked during the su command?

This is the first time it has happened to me where I am using the su command and it actually displays the password on the terminal and doesn't stay hidden. Here is my code snippet: sshpass -p "...
0
votes
1answer
62 views

ssh login doesn't parse .profile or .bashrc properly and is generally being weird

First of all it doesn't load my PS1. It just prompts me with a $ The arrow keys instead of doing what they're supposed to do, the just echo things like: $ ^[[A And that makes it very unusable. A ...
0
votes
1answer
228 views

SSH Key Permissions Chmod settings?

I need to use SSH on my machine to access my website and its databases (setting up a symbolic link- but I digress). Following problem: I enter the command: ssh-keygen -t dsa To generate public/...
0
votes
2answers
298 views

Autentification on SSH connection in OneLine [duplicate]

Possible Duplicate: Shell Script for logging into a ssh server I need to connect via SSH to a remote server, however I must do this with out interactive mode and with out use Public keys and ...
0
votes
1answer
4k views

Remote desktop (KDE) over SSH reverse tunnel

I have a reverse ssh tunnel through a middleman server set up and working. I'm running Kubuntu 12.04 here and on the remote machine. I want to open a remote desktop session. Until now I've been ...
218
votes
4answers
792k views

How to copy files from one machine to another using ssh [duplicate]

I'm using Linux (centos) machine, I already connected to the other system using ssh. Now my question is how can I copy files from one system to another system? Suppose, in my environment, I have two ...
36
votes
1answer
6k views

redirect sound (microphone) via ssh, how to telephone via ssh?

How can I redirect the microphone of one computer to listen to it on another computer via ssh? Which is the right device or which is the right command line? Some years ago it was easy and fun to ...
69
votes
3answers
27k views

Multiple similar entries in ssh config

Say I want to configure my ssh options for 30 servers with the same setup in my .ssh config file: host XXX HostName XXX.YYY.com User my_username Compression yes Ciphers arcfour,...
20
votes
3answers
5k views

What are the pros/cons of the various methods to block brute force SSH attacks?

There are a number of different packages out there to shut out IPs from which brute-force SSH attacks are launched on your system. For example: DenyHosts Sshguard fail2ban What are the pros/cons ...
33
votes
6answers
3k views

Linux equivalent to PowerShell's “one-to-many” remoting

Coming from Windows administration, I want to dig deeper in Linux (Debian). One of my burning questions I could not answer searching the web (didn't find it) is: how can I achieve the so called "one-...
26
votes
6answers
39k views

How can I page up or down in tmux with Terminal.app?

When I am in tmux only a portion of the text shows up. If I try to scroll up or down the console scrolls up but not the actual text. If I do CTRL+b followed by [, I see in the status bar *tmux, and If ...
35
votes
4answers
13k views

Can mouse wheel scrolling work in a Screen session?

Is there any way to use the mouse wheel to scroll through the output of a screen session? I can use the keypad scroll through previous output in screen after pressing ctrl+a [. Is it possible to do ...
26
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3answers
12k views

How to enable autocompletion for remote paths when using scp?

I remote copied a file to my laptop using: scp someFile USER@192.168.178.32:/home/USER/put/it/some/where/oh/damn/you/here I want to be able to autocomplete the remote path by hitting tab.
22
votes
3answers
67k views

How to ensure SSH port is only open to a specific IP address?

This is my /etc/sysconfig/iptables: It has two ports open 80 apache and 22 for ssh. # Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. ...
19
votes
4answers
88k views

Keeping a process running after putty or terminal has been closed [duplicate]

I'm running a node.js server off of a raspbian (Debian) machine, and I'd like to start and stop the server remotely. This for me means using putty to access the shell, except when I close out of the ...
18
votes
7answers
48k views

How to download a file through an SSH server?

I have a server in USA (Linux box B), and my home PC (Linux box A), and I need download a file from website C, The issue is, it is very slow to download a file direct from A, so I need download the ...
13
votes
2answers
62k views

SSH key-based authentication: known_hosts vs authorized_keys

I read about setting up ssh keys in Linux and have some questions. Correct me if I'm wrong… Let's say host tr-lgto wants to connect to host tr-mdm using ssh. If we want to be sure that it's the real ...
53
votes
5answers
45k views

What is the point of sshd “UseDNS” option?

I know what it does, but i don't know why. What attack(s) does it prevent ? Is it relevant for all kind of authentication methods ? (hostbased, password, publickey, keyboard-interactive ...)
54
votes
2answers
8k views

How does SSH connection survive a network restart?

From a Linux SSH shell, type /etc/init.d/network restart to restart the network service. I expect my SSH connection to die since the network service goes down. But it doesn't. Very cool. But how does ...
12
votes
6answers
4k views

How to effectively use screen and SSH?

I'd like to configure SSH and screen such that a login will always reattach to a screen session. Ideally, that session would not quit but detach when I press C-d. How can this be achieved? And what ...
24
votes
2answers
81k views

how to connect ssh 'with' specified port?

I know how to connect 'to' a certain port when ssh'ing. ssh user@remotehostip -p XXX but is there a way to establish a ssh 'with' a certain port? I mean, is there a way to specify the port which ...
20
votes
3answers
2k views

How to prevent shutdown when an SSH user is logged in?

I'm administrating a networked environment and I had an interesting situation arise yesterday. When a host is required to shutdown by a regular user, it refuses to do so if other users are logged in ...
15
votes
3answers
16k views

Differences between VNC and ssh -X

Why would you use VNC (or for that matter NX) instead of just using ssh -X (-Y). I read that VNC uses less bandwidth, but is there any other differences/advantages with respective tool?
12
votes
5answers
25k views

Use socks proxy for commands in terminal

I connect to a remote ssh server by running this command: ssh -D 12345 bob@myserver.com This creates a socks proxy that I can use with Firefox to bypass censorship in my country. However, I can't ...
11
votes
2answers
1k views

Understanding SSH tunnels

I have linux (Ubuntu) server which I have root access to through ssh (port 22) only. On that server there is a MySQL database listening on port 3306. Is it possible to use putty (on my machine) and ...
8
votes
1answer
2k 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 ...
8
votes
1answer
4k views

SSH over Socks proxy without username or password

I have a list of SOCKS proxy servers from this site. I've read about creating a dynamic tunnels with ssh -D and to be honest i've tried that already. Unfortunately for some reason I cannot connect to ...
2
votes
3answers
39k views

Method to check connectivity to other server

I want to check connectivity between 2 servers (i.e. if ssh will succeed). The main idea is to check the shortest way between server-a and server-b using a list of middle servers (for example if I'm ...
29
votes
4answers
25k views

Why SSH takes a long time to Connect

I have noticed that some Linux Servers in Network takes long time to connect using ssh. Situations: There are two situations I have faced: On some servers some times it takes a long time to ask ...
28
votes
2answers
76k views

Convert Amazon .pem key to Putty .ppk key Linux

I have generated and downloaded a private .pem key from AWS. However, to use Putty in order to connect to the virtual machine, I must have that key in .ppk format. The process of conversion is ...