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Top Forums Shell Programming and Scripting Can BASH execute commands on a remote server when the commands are embedded in shell Post 302264345 by bash_in_my_head on Wednesday 3rd of December 2008 04:54:15 PM
Old 12-03-2008
Can BASH execute commands on a remote server when the commands are embedded in shell

I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little bewildered about whether I can execute commands on the remote server from within my BASH script.
I am thinking that It would be necessary to use expect. I have looked at expect and am not sure I want to go there.

I currently have
# ./copy_to_server httpd.conf.new /etc/httpd/conf/ 192.168.1.100
#/bin/bash
FILE1=$1
FILE2=$2
FILE3=$3
FILE4=$4
FILE5=$5
FILE6=$6



if [ ! -f "$FILE3" ]; then
scp $FILE1 $FILE3:$FILE2
else
echo "$FILE3 is not up"
fi

##########
So the file is on the remote server, now I want to move around some exsting files.

Now I am unsure how to set up to check for the existing httpd.conf and move it around on the remote server using BASH.
[ -f /etc/httpd/conf/httpd.conf ]
mv /etc/httpd/conf/httpd.conf /etc/httpd/conf/httpd.conf.bk_up
mv /etc/httpd/conf/httpd.conf.new /etc/httpd/conf/httpd.conf

And then log off

Can BASH do this on its own?

I thought that one way around this would be to create a cron job to check /etc/httpd/conf/ dir for a new file
when it finds httpd.conf.new it could move over the old and move in the new.

So now I am curious is executing multiple commands on a remote server via bash possible? and then logging off.

Any suggestions are appreciated.

Last edited by bash_in_my_head; 12-04-2008 at 09:50 PM..
 

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HTTPD(8)							       httpd								  HTTPD(8)

NAME
httpd - Apache Hypertext Transfer Protocol Server SYNOPSIS
httpd [ -d serverroot ] [ -f config ] [ -C directive ] [ -c directive ] [ -D parameter ] [ -e level ] [ -E file ] [ -k start|restart|grace- ful|stop|graceful-stop ] [ -R directory ] [ -h ] [ -l ] [ -L ] [ -S ] [ -t ] [ -v ] [ -V ] [ -X ] [ -M ] [ -T ] On Windows systems, the following additional arguments are available: httpd [ -k install|config|uninstall ] [ -n name ] [ -w ] SUMMARY
httpd is the Apache HyperText Transfer Protocol (HTTP) server program. It is designed to be run as a standalone daemon process. When used like this it will create a pool of child processes or threads to handle requests. In general, httpd should not be invoked directly, but rather should be invoked via apachectl on Unix-based systems or as a service on Win- dows NT, 2000 and XP and as a console application on Windows 9x and ME. OPTIONS
-d serverroot Set the initial value for the ServerRoot directive to serverroot. This can be overridden by the ServerRoot directive in the configu- ration file. The default is /usr/local/apache2. -f config Uses the directives in the file config on startup. If config does not begin with a /, then it is taken to be a path relative to the ServerRoot. The default is conf/httpd.conf. -k start|restart|graceful|stop|graceful-stop Signals httpd to start, restart, or stop. See Stopping Apache httpd for more information. -C directive Process the configuration directive before reading config files. -c directive Process the configuration directive after reading config files. -D parameter Sets a configuration parameter which can be used with <IfDefine> sections in the configuration files to conditionally skip or process commands at server startup and restart. Also can be used to set certain less-common startup parameters including -DNO_DETACH (prevent the parent from forking) and -DFOREGROUND (prevent the parent from calling setsid() et al). -e level Sets the LogLevel to level during server startup. This is useful for temporarily increasing the verbosity of the error messages to find problems during startup. -E file Send error messages during server startup to file. -R directory When the server is compiled using the SHARED_CORE rule, this specifies the directory for the shared object files. -h Output a short summary of available command line options. -l Output a list of modules compiled into the server. This will not list dynamically loaded modules included using the LoadModule directive. -L Output a list of directives together with expected arguments and places where the directive is valid. -M Dump a list of loaded Static and Shared Modules. -S Show the settings as parsed from the config file (currently only shows the virtualhost settings). -T (Available in 2.2.17 and later) Skip document root check at startup/restart. -t Run syntax tests for configuration files only. The program immediately exits after these syntax parsing tests with either a return code of 0 (Syntax OK) or return code not equal to 0 (Syntax Error). If -D DUMP_VHOSTS is also set, details of the virtual host con- figuration will be printed. If -D DUMP_MODULES is set, all loaded modules will be printed. -v Print the version of httpd, and then exit. -V Print the version and build parameters of httpd, and then exit. -X Run httpd in debug mode. Only one worker will be started and the server will not detach from the console. The following arguments are available only on the Windows platform: -k install|config|uninstall Install Apache httpd as a Windows NT service; change startup options for the Apache httpd service; and uninstall the Apache httpd service. -n name The name of the Apache httpd service to signal. -w Keep the console window open on error so that the error message can be read. Apache HTTP Server 2012-02-10 HTTPD(8)
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