Remote SSH command bash script with text file input

[markdjones82]

All,
I am looking for a bash script that will take a text file with a list of host names and then go through a loop and run an SSH command on each host in the list.

Any help?

[hugortega]

Check the script in:
Shell Script Utility To Read a File Line By Line

and, into the processLine function, use:

processLine(){
  line="$@" # get all args
   ssh user@$line 'command -to -execute'
}

[markdjones82]

Hugo, that script seems to have a lot of extra lines of code than what I am needing. Is there a smaller script you know of?

[coopstah13]

sounds like homework question, I would look at bash tutorial, this is a pretty simple task, should only be a few lines of script

man cat

[markdjones82]

lol not a homework question, this is for work. I need to run remote ssh commands but I don't want to have to paste the server list in the script, but want it to read a list of hostnames in a text file.

here is what I have so far, with the hostnames in the actual script.

#!/bin/bash
# Linux/UNIX box with ssh key based login
#Hosts
SERVERS=" servernames"
# SSH User name
USR="root"

# connect each host and pull up user listing
for host in $SERVERS
do

ssh $USR@$host 'command'
done

[coopstah13]

use cat, is what I'm trying to say

for i in `cat file` ; do
 echo $i
done

[hugortega]

for address in `cat file`; do
   ssh user@$address 'command -to -execute'
done

You can authenticate your local user into all the servers using private/public keys to avoid the input of passwords on each server.

Hugo