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Top Forums Shell Programming and Scripting Execute commands parallel in a for loop ? Post 90653 by networkfre@k on Friday 25th of November 2005 05:47:55 AM
Old 11-25-2005
Execute commands parallel in a for loop ?

Hi,

please can someone point me in the right direction with a shell scripting problem.
I want to execute a command in a for loop and the command should be started not one-by-one meaning the for loop is waiting for the exit code , it should be started in parallel.

I have a plain text file where a hostname stands in each line.

#!/bin/bash

file="/tmp/serverlist"

for server in `cat $file` ; do

ssh admin@$server "command to run"

done

the problem is :

the command I execute with SSH takes approx. 10 minutes to complete.

I have to run the command on 145 servers and I dont want to wait 10 mins to go to the next. I want to execute it in parallel say on 10 servers at a time.

Any ideas ? simply putting a & after the SSH commands didnt work, nor with continue ?


thanks for your help again...
 

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SSH-ARGV0(1)						    BSD General Commands Manual 					      SSH-ARGV0(1)

NAME
ssh-argv0 -- replaces the old ssh command-name as hostname handling SYNOPSIS
hostname | user@hostname [-l login_name] [command] hostname | user@hostname [-afgknqstvxACNTX1246] [-b bind_address] [-c cipher_spec] [-e escape_char] [-i identity_file] [-l login_name] [-m mac_spec] [-o option] [-p port] [-F configfile] [-L port:host:hostport] [-R port:host:hostport] [-D port] [command] DESCRIPTION
ssh-argv0 replaces the old ssh command-name as hostname handling. If you link to this script with a hostname then executing the link is equivalent to having executed ssh with that hostname as an argument. All other arguments are passed to ssh and will be processed normally. OPTIONS
See ssh(1). FILES
See ssh(1). AUTHORS
OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen. Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos, Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH. Markus Friedl contributed the support for SSH protocol versions 1.5 and 2.0. Jonathan Amery wrote this ssh-argv0 script and the associated documentation. SEE ALSO
ssh(1) Debian Project September 7, 2001 Debian Project
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