Run a script in parts on 2 servers Post: 302680339

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Top Forums Shell Programming and Scripting Run a script in parts on 2 servers Post 302680339 by Chubler_XL on Wednesday 1st of August 2012 05:36:07 PM

08-01-2012

Moderator

OK,

the $(cat local_script) inline command is evaluated on server1 before ssh is executed. This is done by the shell as part of parseing the command line.

This basically dumps the contents of local_script into the command line at the tagged point so the command line is:

Code:

ssh user@server2 "cat > temp_script.sh <<temp_script_EOF
ls -l | wc -c
temp_script_EOF
chmod +rx temp_script.sh
./temp_script.sh
rm temp_script.sh"

ssh will prompt for a password for user and then execute the following on server2 (as user "user"):

Code:

cat > temp_script.sh <<temp_script_EOF
ls -l | wc -c
temp_script_EOF
chmod +rx temp_script.sh
./temp_script.sh
rm temp_script.sh

A "here document" is being passed into cat and redirected out to a (temprary file) "temp_script.sh". The end result here is that local_script from server1 is copied over to server2 as temp_script.sh. chmod makes the script readable and executable then the script is run (with ./temp_script.sh) and the finally deleted.

Chubler_XL

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LEARN ABOUT HPUX

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