if I ssh to another linux env, and run a command that gives me a result, can I grab that ssh result and store it locally? I have a ksh script that run locally on one linux box right now, but I need to get some parameters from another linux box into that script.
Sure, ssh is a command just like any other, but this will be trickier if you want to ssh interactively and do it, but this could work:
var=$(ssh user#host command_with_output)
then $var will show the output of command_with_output
All this works best if ssh doesn't require a password as well
Related
I couldnt find answer to this althougth there are many similar questions.I wanted to change colour of my linux command prompt based on the remote host i have ssh to.Since bash environment variables are not preserved over ssh,so how could i do this.There are hundreds of server i login everyday.So changing /.bashrc of each remote host is not possible.is there a way i can pullout a script which can be called each time ssh is done.Can someone please give in detail of which file and how it should be edited.gnome,openssh etc are not supprted.
during ssh execution,a new login shell was executed.
during shell login the *rc files are not executed,only *profile was executed.
so place your code in /etc/profile or ~/.bash_profile.
"Since bash environment variables are not preserved over ssh..."
man ssh
Additionally, ssh reads ~/.ssh/environment, and adds lines of the format
“VARNAME=value” to the environment if the file exists and users are
allowed to change their environment. For more information, see the
PermitUserEnvironment option in sshd_config(5).
No where online can i find a way to run a shell script on a remote server from another script. This is for automation, so the script on the host machine will automatically trigger another script on a different server. The server that my script will ssh to will either have a password prompt or have RSA key pair set up
Thanks!
Just pass the command as an argument to ssh.
ssh someserver /path/to/some/script.bsh
Let's say you want to execute a script on node2 but you have your script on node1 file name of script is sp over location /home/user/sp. Simply
ssh node2 < /path-of-the-script-including-the-filename
Another way, using expect package.
Disclaimer: This you can use for testing environments since it has an
open password. but depends on your usecase
If your server does not have expect, you may add the package then. run the command. You can also put this command inside an .sh script.
expect -c 'spawn ssh user#10.11.12.13 "/path/to/my.sh"; expect "assword:"; send "Y0urp#ssw0rd\r"; interact'
I am using shell script to add some file to server. Is there any way to write a shell script that will execute one part on local computer and the other part when you're logged into that server?
For example, I want to log in, do something, add some file, and then I want to list everything on that server.
ssh something#something
I enter password
Then list files from server.
You can just add a command to end of the ssh command; for example:
ssh username#host ls
will run ls on the server, instead of giving you a login shell.
I'd like to execute multiple commands consecutively using a matlab system call. I would first like to ssh into a remote machine then run a program on that machine. After the program starts I would like to then enter another command into this program's console. Here is what I would like to do in code:
system('ssh othermachine')
system('command on other machine')
%%WAIT FOR PROGRAM TO START RUNNING ON OTHER MACHINE
system('run command on other machine')
The problem is that Matlab will hang on the first system call and won't proceed to the next system call until the process form the first is exited. Is there a way around this?
Thanks for your help!
Prologue: Your problem is general and not just related to matlab.
When you want to run remote commands via ssh, they have to be issued in the ssh call. In a (linux) shell, you'd have
$ ssh remotemachine command1
for a single command. Hence, using a matlab system call you would have
>> system('ssh remotemachine command1').
When you want multiple commands to be executed sequentially, in a shell you'd write
$ ssh remotemachine "command1; command2"
i.e., in matlab, you'd write something like
>> system('ssh remotemachine "command1; command2"').
In general, is way more elegant to group your commands in a shell script, say script.sh, and pipe it in the ssh call
$ cat script.sh | ssh remotemachine
which, in matlab shell, sounds like
>> system('cat script.sh | ssh remotemachine').
There are a number of flags you can add in order to specify which behavior you want (e.g. in terms of session detachment/background execution, output collection,... look e.g. here).
I have a shell script that I need to automate with cron. At our office, there is a specific machine that I must log in to in order to use cron. My problem is, that the script I have written interacts with git, using git commands to pull code and switch branches. The machine where I am able to schedule cron jobs and the script is being run from does not have git on it. I have a separate machine that I log in to when I am using git. Is there an easy way for me to run my script from the cron system and run the git part from the git system?
UPDATE: I am still interested if this can be done, but my team has acquired a new machine that we will set up however we choose, meaning that it will have cron and git. Thanks for any ideas
As some people have mentioned above, ssh is the way to do this. This is a bash line that I use a lot in my job, for gathering data from other servers:
ssh -T $server -l username "/export/home/path/to/script.sh $1 $2" 1>traf1.txt 2>/dev/null
The above code sample will connect to the ip $server, as user username and run the script script.sh, passing it the parameters $1 and $2. Instead of redirection you could also assign the command output to a variable, just as you would with any other command in your script.
PS: Please note that in order for the above to work, you will need to set up passwordless login between those machines. Otherwise your script will break to request password input, which is most probably not the desired behavior.