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Full Discussion: script to send command periodically to remote server
Top Forums Shell Programming and Scripting script to send command periodically to remote server Post 302175983 by era on Monday 17th of March 2008 03:42:14 AM
Old 03-17-2008
If I understand you correctly, you want to run a new ssh command every three seconds, regardless of the fact that the previous ssh command could have taken more than three seconds to complete? So run them in the background.

Code:
while true; do
  ssh user@domain echo a &
  sleep 3
done

The "&" there runs the command in the background.

I assume that "echo a" is the command you want to run on the remote server, and that you had the syntax for this wrong (too).

Unless you are running a real-time operating system, there is no guarantee that "sleep 3" will not take more than 3 seconds, of course.

Edit: Upon rereading your question, I guess that the real problem was really how to pass the remote command to the server over ssh. Well, I coincidentally seem to have answered that, too. If you don't want the ssh to run in the background, just take out the "&".
era
 

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LEARN ABOUT PHP

ssh-argv0

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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