In ssh, I can use ssh root#myhost -t "cd mydir; bash -i" to do that, how can I run 2 commands in mosh with one line
According to man mosh(1), you can do the same with mosh, but you need to add the -t option to the ssh:
mossh root#myhost --ssh="ssh -t" "cd mydir; bash -i"
Related
I have gitlab CI job which had a script execution like below:
stage: permissions
script:
sshpass -p "${PASSWORD}" ssh ${USER}#${HOST} sudo chown -cv user_a:user_a ${directory}/test.txt
The above gives me following error:
sudo: sorry, you must have a tty to run sudo
If i add -t with ssh i get:
Pseudo-terminal will not be allocated because stdin is not a terminal.
sudo: sorry, you must have a tty to run sudo
If i add -tt with ssh, the job keeps waiting for me to enter the password.
My requirement is to execute a remote command using ssh and text password i.e. sshpass, is there a way i can achieve this without change any sudoers permissions over the server?
Use somethinc like:
sshpass -p "${PASSWORD}" ssh ${USER}#${HOST} sh -c "echo ${PASSWORD} | sudo chown -cv user_a:user_a ${directory}/test.txt"
Example for write password from not tty to sudo:
echo ${PASSWORD} | sudo -S command
p.s. For configure servers use Ansible, he handles such tasks very easily.
I am trying to execute commands over ssh remotely.
It's 2x remote (2 level deep).
From my host, I ssh into target1 which is connected to target2.
I need the commands executed on target2.
There is no direct connection from host to target2.
Ex:
ssh root#target1 -t "ssh root#target2 -t "cat /usr/value""
The above command works.
ssh root#target1 -t "ssh root#target2 -t "echo 1 > /usr/value""
This command does not work. I get "No such file or directory"
You are trying to use a shell feature (redirection) instead of a command, so run that via shell (note: quoting gets tricky):
ssh -t root#target1 'ssh -t root#target2 /bin/bash -c \"echo 1 > /usr/value\"'
I suggest you study the man page for ssh_config. For instance, with this:
Host target2
User root
ProxyJump root#target1
your above command would be:
ssh -t target2 '/bin/bash -c "echo 1 > /usr/value"'
The next step is to use ansible (or similar) for system changes.
Commands the server through ssh.
The output of each command must be stored separately.
ssh -i ~/c.pem ubuntu#server 'cd /tmp'
ssh -i ~/c.pem ubuntu#server 'pwd'
I want to have "/tmp" output when I run this code.
How do I run multiple commands in previous session?
Use a ; between commands to execute them sequentially.
ssh -i ~/c.pem ubuntu#server 'cd /tmp; pwd'
I am looking to script something in batch which will need to run remote ssh commands on Linux. I would want the output returned so I can either display it on the screen or log it.
I tried putty.exe -ssh user#host -pw password -m command_run but it doesn't return anything on my screen.
Anyone done this before?
The -m switch of PuTTY takes a path to a script file as an argument, not a command.
Reference: https://the.earth.li/~sgtatham/putty/latest/htmldoc/Chapter3.html#using-cmdline-m
So you have to save your command (command_run) to a plain text file (e.g. c:\path\command.txt) and pass that to PuTTY:
putty.exe -ssh user#host -pw password -m c:\path\command.txt
Though note that you should use Plink (a command-line connection tool from PuTTY suite). It's a console application, so you can redirect its output to a file (what you cannot do with PuTTY).
A command-line syntax is identical, an output redirection added:
plink.exe -ssh user#host -pw password -m c:\path\command.txt > output.txt
See Using the command-line connection tool Plink.
And with Plink, you can actually provide the command directly on its command-line:
plink.exe -ssh user#host -pw password command > output.txt
Similar questions:
Automating running command on Linux from Windows using PuTTY
Executing command in Plink from a batch file
You can also use Bash on Ubuntu on Windows directly. E.g.,
bash -c "ssh -t user#computer 'cd /; sudo my-command'"
Per Martin Prikryl's comment below:
The -t enables terminal emulation. Whether you need the terminal emulation for sudo depends on configuration (and by default you do no need it, while many distributions override the default). On the contrary, many other commands need terminal emulation.
As an alternative option you could install OpenSSH http://www.mls-software.com/opensshd.html and then simply ssh user#host -pw password -m command_run
Edit: After a response from user2687375 when installing, select client only. Once this is done you should be able to initiate SSH from command.
Then you can create an ssh batch script such as
ECHO OFF
CLS
:MENU
ECHO.
ECHO ........................
ECHO SSH servers
ECHO ........................
ECHO.
ECHO 1 - Web Server 1
ECHO 2 - Web Server 2
ECHO E - EXIT
ECHO.
SET /P M=Type 1 - 2 then press ENTER:
IF %M%==1 GOTO WEB1
IF %M%==2 GOTO WEB2
IF %M%==E GOTO EOF
REM ------------------------------
REM SSH Server details
REM ------------------------------
:WEB1
CLS
call ssh user#xxx.xxx.xxx.xxx
cmd /k
:WEB2
CLS
call ssh user#xxx.xxx.xxx.xxx
cmd /k
i am wondering how does fabric execute commands.
Let's say I give him env.user=User, env.host=HOST. Then i ask him to sudo('ls')
Is that equivalent to me typing in a shell : ssh User#host 'sudo(/bin/ls)'
or it's more : ssh User#host in a first time, then sudo ls commande in a seconde time ?
I'm asking that because sometimes using a shell, if the TTY has a bad configuration (I am a bit blurry on this), ssh User#Host 'sudo /bin/ls'
return : sudo: no tty present and no askpass program specified
but you can first log in with ssh User#Host then sudo ls and it works.
I don't know how to replicate the no tty error, but I know it can occurs. Would this block the sudo commande from Fabric?
Basically how it works is:
First a connection is established (equivalent as doing ssh User#host)
Over this connection a command is executed as follows:
sudo -S -p 'sudo password:' /bin/bash -l -c "your_command"
You can also allow Fabric not to request a pty with either pty=False argument, env.always_use_pty=False or --no-pty commandline option.