Question

I need to collect user information from 100 remote servers. We have public/private key infrastructure for authentication, and I have configured ssh-agent command to forward key, meaning i can login on any server without password prompt (auto login).

Now I want to run a script on all server to collect user information (how many user account we have on all servers).

This is my script to collect user info.

#!/bin/bash
_l="/etc/login.defs"
_p="/etc/passwd"

## get mini UID limit ##
l=$(grep "^UID_MIN" $_l)

## get max UID limit ##
l1=$(grep "^UID_MAX" $_l)

awk -F':' -v "min=${l##UID_MIN}" -v "max=${l1##UID_MAX}" '{ if ( $3 >= min && $3 <= max  && $7 != "/sbin/nologin" ) print $0 }' "$_p"

I don’t know how to run this script using ssh without interaction??

Answer 1

Since you need to log into the remote machine there is AFAICT no way to do this “without ssh”. However, ssh accepts a command to execute on the remote machine once logged in (instead of the shell it would start). So if you can save your script on the remote machine, e.g. as ~/script.sh, you can execute it without starting an interactive shell with

$ ssh remote_machine ~/script.sh

Once the script terminates the connection will automatically be closed (if you didn’t configure that away purposely).