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

learn more… | top users | synonyms

5
votes
3answers
7k views

ssh remote server on some port other than 22 without password

I am usually connecting to the remote server with ssh user@server.com -p 11000 and then giving the password each time for user. How should I avoid entering the password each time I connect ...
5
votes
2answers
2k views

Multiple SSH private keys, possible?

Is it possible to have multiple SSH key in a single client, and let ssh choose the right one automatically?
5
votes
4answers
262 views

SSH “sleeping” for a long time before connect? [duplicate]

Possible Duplicate: How to speed my too-slow ssh login? I have a very strange issue with my SSH server. Whenever I attempt to connect, it literally waits about 30 seconds to a minute before ...
5
votes
2answers
3k views

What causes a ssh interruption?

What exactly causes a ssh connection to interrupt? When you idle for a while, it disconnects. How do I keep the connection alive (without autossh or reconnect)?
5
votes
3answers
852 views

Is there any disadvantage in using SSHFS instead of SSH alone?

I find it easier to use SSHFS to mount a remote file system on my local computer instead of plainly SSH'ing into the remote computer. This saves me from using all the complicated scp commmands for ...
5
votes
1answer
980 views

Reusing ssh session for repeated rsync commands [duplicate]

Possible Duplicate: Using an already established SSH channel I have a remote server accessible via a chain of SSH proxies. The resulting channel is wide and fast enough, but setting it up ...
5
votes
2answers
7k views

How to configure SVN/SSH with SSH on non standard port?

I have configured SSH to be on port 20000. When I try: svn co svn+ssh://server.com:20000/home/svn/proj1 proj1 --username jm I get svn: To better debug SSH connection problems, remove the -q ...
5
votes
1answer
1k views

How many users does Linux support being logged in at the same time via SSH?

I know Linux supports multiple users being logged in at the same time. But what's the maximum number of users that can be logged into Linux at the same time? I see there are there are 69 tty files ...
5
votes
5answers
458 views

How to setup password-less ssh with RSA keys

I am trying to setup a password-less SSH configuration between two machines and am having trouble. There are a ton of howtos out there that I have followed and have had no success. Here are ...
5
votes
2answers
3k views

How to properly run “top” command through SSH?

I have to run top command on one computer being on another. My targeted PC has IP 192.168.0.81 I was trying to do it: ssh 192.168.0.81 top But I got this result: top: tcgetattr() failed: Invalid ...
5
votes
4answers
5k views

What are the different ways that a message can be displayed to a bash shell after a user logs in?

I have a CentOS 5.7 VPS using bash as its shell that displays a branded greeting immediately after logging in via SSH. I've been trying to modify it, but can't seem to find where it is in the usual ...
5
votes
4answers
7k views

Set some firewall ports to only accept local network connections?

Basic firewall question: How do I set up the firewall on a system in a LAN so that some ports are only open to connections from the local area network, and not from the outside world? For instance, ...
5
votes
2answers
771 views

Should I be backing up my SSH host keys?

In my automated backups, I'm not sure if I should be doing this. If the hard drive fails or if I wipe the hard disk and start over, what will be the effect of starting with a new SSH host key to my ...
5
votes
2answers
168 views

Writing a “telnet server” type program that uses SSH instead of telnet

So people have written server programs using telnet in which the user simply does telnet server.com and this connects them to the server program, which then provides them with a textual program they ...
5
votes
1answer
237 views

Running programs over ssh

I am planning to log in to my college PC using ssh and run some simulations. These simulations take very long time, so I would like the relevant process to run longer than the ssh session (I want to ...
5
votes
2answers
236 views

Provide user name when using vim with scp

I was reading about SSH here http://blogs.perl.org/users/smylers/2011/08/ssh-productivity-tips.html and found that you can use vim to directly modify a file on a remote server that you can ssh into. ...
5
votes
2answers
4k views

How do I disable remote root login via ssh?

How do I disable remote root login via ssh? I want to log into my server (I use keys on my main comp) then su into root instead of access root directly. I am using Debian. I follow guides online ...
5
votes
2answers
99 views

How to input a network file using scp to ffmpeg

My problem is this. I have access to a server that hosts many video files, most of them are very large and not well compressed. I intend to make a reduced quality smaller size copy of these on my ...
5
votes
3answers
189 views

Permit root to login via ssh only with key-based authentication

I have some doubts about certain ssh server configurations on /etc/ssh/sshd_config. I want the next behavior: Public key authentication is the only way to authenticate as root (no password ...
5
votes
3answers
486 views

Remote shell script Enter passphrase for

How can I run a script to log into a remote server and execute a remote ssh command without entering in my passphrase? For example: When I log onto a remote server and execute the git pull command I ...
5
votes
2answers
1k views

Detach/reattach an application run on X over SSH?

I have a development server that I leave running all the time, and a development laptop that I turn off/on everyday. I have a GUI application on the server that I'd like to run over SSH -X, and I'd ...
5
votes
3answers
199 views

I'm moving up from managed hosting to a VPS. What do I need to know?

I'll be starting to use a VPS for my web hosting this week, which is a big step-up for me since I've only used managed/shared services before. I've a bit of experience with Linux and I'm not afraid of ...
5
votes
1answer
2k views

What happens when your password expires and you're using key authentication?

on one of the boxes I don't control at work I use ssh keys to log in. Our passwords are set to expire after a few months. What happens if I don't reset my password and it expires? will I still be able ...
5
votes
1answer
4k views

Remote for-loop over SSH

I have the following in a script for server in ${servers[@]}; do echo ${server} ssh user@${server} "for i in /tmp/foo* ; do echo ${i}; done" done But it doesn't work. Weird thing, I see $I amount ...
5
votes
2answers
251 views

How to disable the try again password in ssh command

I want the ssh command to only allow one chance in typing the password, if the password was wrong at the first time the ssh will return Permission denied (publickey......). Is there a flag that ...
5
votes
7answers
297 views

Are there additional ways to protect SSH connections besides firewall and RSA Keys?

Sometimes I don't have a static IP and need to administrate my web server remotely. I'm looking for any additional layers of protection I could add to make opening port 22 safer. Currently I have ...
5
votes
3answers
435 views

Run ssh login command without modifying remote .bashrc

We have a bunch of servers set up with set -o vi in their ~/.bashrc. It would be nice to be able to ssh into these boxes and automagically run set -o emacs as a timesave. I've seen a solution ...
5
votes
2answers
4k views

Not able to ssh in to remote machine using shell script in Crontab

Below is the script which i am trying to run, which runs without any issue for i in `seq 200 2100` do usr=(`ssh -t -t -o ConnectTimeout=60 machine$1 finger | tail -1 | awk '{print$1}'`) echo ...
5
votes
4answers
219 views

History of IP addresses that accesed a server via ssh

It has come to my attention that a server of mine has been hacked and infected with a known chinese botnet. It was a prototype/testing virtual machine with its own static IP(US address) so no harm ...
5
votes
1answer
79 views

Cannot start xterm over ssh after several successes

I am running some MATLAB scripts on the command-line of a remote computer using ssh. These scripts launch 5 xterms that are forwarded to me via ssh (using the -X option). At the moment I am debugging ...
5
votes
3answers
3k views

How can I run ssh-add automatically, without password prompt?

I want to communicate between several computers on my network (static ethernet), through ssh. In order to do that I need to run ssh-add every time I login on specific machine, how can I do it so that ...
5
votes
2answers
7k 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 ...
5
votes
4answers
723 views

ssh command unexpectedly continues on other system after ssh terminates

I'm running the below command, and monitoring the output file on the other system: ssh $ip_address 'for n in 1 2 3 4 5; do sleep 10; echo $n >>/tmp/count; done' If I kill the ssh command ...
5
votes
1answer
2k views

Why don't Page U/Down, Home/End work in less on Solaris over ssh from Ubuntu?

I need to work on a Solaris server over ssh from my Ubuntu (Lucid) laptop. I got Home/End Insert/Delete Page Up/Down working in csh and bash using bindkey and ~/.inputrc, respectively. But I can't ...
5
votes
3answers
564 views

Bash: interactive remote prompt

I have a script which connects to a remote server and check if some package is installed: ssh root@server 'bash -s' < myscript.sh myscript.sh: OUT=`rpm -qa | grep ntpdate` if [ "$OUT" != "" ] ; ...
5
votes
1answer
94 views

hosts.allow: %u not working (log username)

I need to keep track of all SSH connections on my server. In my /etc/hosts.allow I have something like this: sshd: ALL : spawn ( echo "`date` from %u %a " >> /var/log/ssh/%d.log ) & where ...
5
votes
2answers
714 views

Regexp in .ssh/config

At work, I often have to log into hosts which follow a common naming scheme, e.g. qc01 - qc12, hc01 - hc10, and so on. All of these need to get the same config values in my laptop's .ssh/config. Of ...
5
votes
3answers
333 views

As what user is an sshfs mounted folder being accessed?

I'm trying to do a network backup of a drive. There are two machines in this process. PC1: Distant machine with 2 hards sda and sdb sdb is the drive which needs backing up two users exist, root and ...
5
votes
1answer
1k views

How to safely resume an aptitude dist-upgrade after SSH timeout?

I started aptitude dist-upgrade over SSH on my local network. At some point the session timed out but the upgrade was not finished (it was left at one of those accept software agreement screens-- I ...
5
votes
1answer
332 views

Is it safe to use /bin/cat as shell for a restricted user?

I need to remontely log on to few peoples machines to do maintanance tasks, but sometimes the machines can be behind firewalls or NAT's. The way I have been doing it is to give the user advice on how ...
5
votes
2answers
2k views

Passing SSH options to git-clone

I connect to my server using SSH: ssh user@server -p 2224 -zZ abcd I also have a git repository on my server. The only way I know to clone is: git clone ssh://user@server.com:2224/path/to/repo ...
5
votes
1answer
304 views

SSH HTTP Tunnelling

I am trying to set up an SSH account on my server for someone, and I only want to give them access to tunneling internet traffic. I set their user's "shell" to /bin/true, so now when they SSH (and ...
5
votes
2answers
72 views

Serve Internet to remote machine via SSH session?

The machine via which I'm SSHing to the remote/host machine (same network/LAN) has access to the Internet but the host doesn't. Running updates and installing packages on the host gets quite ...
5
votes
2answers
370 views

How to disable login for an user?

My Linux has many not-human users like cron, ntp, daemon, http, etc. I want to disable anybody to login as any of this users. Real people on my machine are root and me, so only root and me should be ...
5
votes
1answer
247 views

Automated ssh login with passphrase?

Logging onto a machine over ssh typically requires a password to be entered before access is granted. Alternatively, a key/certificate (without a passphrase) can be installed onto the remote machine ...
5
votes
2answers
1k views

SSH LocalCommand on exit

In ~/.ssh/config you can use the LocalCommand directive to execute a local command whenever you connect to a remote machine via SSH. But how do I execute a command when I exit an SSH connection? It ...
5
votes
1answer
220 views

Public Key Auth + Kerberos

I've setup public key authentication for ssh'ing into my university machine. However, it only logs me in on the local machine and doesn't give me Kerberos credentials which I need for accessing my ...
5
votes
1answer
330 views

Why is it possible to leave CHROOT with this sftp config?

I'm trying to create the user lenny, that has read and write permissions in the folder /home/lenny/ and has no shell but only access via SFTP. I'm doing the following: useradd lenny mkdir /home/lenny ...
5
votes
1answer
198 views

Does a remote system accessed with SSH have a system clipboard?

According to wikipedia in the bash shell control+u Clears the line content before the cursor and copies it into the clipboard If I'm ssh'ed into a box and try that, the text certainly disappears ...
5
votes
1answer
793 views

playing a sound/notification in finch over ssh on my local machine

So I have finch, a command line chat client (think pidgin) running on a remote machine that I ssh into. finch has notification sounds and can run a command when certain events occur, letting you pass ...