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Full Discussion: Problem with executing script using ssh
Top Forums Shell Programming and Scripting Problem with executing script using ssh Post 302224725 by maethlin on Wednesday 13th of August 2008 09:09:21 PM
Old 08-13-2008
Problem with executing script using ssh
I'm writing a script which is meant to ssh into a remote machine, sed a file there, and write the output to a new file on the remote machine. Obviously the easy way to do this is to write and execute the script on the remote machine, but I'm trying to do this all via ssh since I like to keep and execute my scripts from a central location.

So here's my extremely ugly attempt so far:

#Do the following on a remote server:
#ssh in, then operates on some files in the remotedir directory
#sed from an "mg" file (such as host1.mg), replacing all instances of
#host1 and replacing it with a new string from a after.conf
#and then writing the output to the remotedir directory.
#Assume that the after.conf only has one value right now (host2)

remotebox="remote1"
adminssh="sudo -u admin ssh $remotebox"
before="host1"
remotedir="/dir/remotedir"


for after in `cat after.conf`
do
echo $target
$adminssh sed -e 's/$source/$target/g' $remotedir/$source.mg > $target.mg

done

========================================
This works up to a point for me. But as it stands now, it bombs out with the following error:

sed: -e expression #1, char 0: no previous regular expression

I'm assuming this is because I am mis-using sed somehow. Even if I replace the sed command with something like this:

$adminssh "cat $remotedir/$source.mg > $remotedir/$target.mg"

the script bombs out - it seems like the redirect is trying to force the output onto my local machine I think. I'm sure I'm doing several things wrong here. Can anyone help?
 

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LEARN ABOUT MINIX

ifp

IFP(1)							      General Commands Manual							    IFP(1)

NAME

       ifp - access iRiver iFP audio devices

SYNOPSIS

       ifp command [arguments ...]

DESCRIPTION

       ifp  lets  you manage your music on an iRiver iFP music player acting in "Manager Mode". If your player is using "UMS Mode", then you don't
       need this program; it will appear as new drive when you plug it in.

       This manual page documents the version of ifp included as an example application for the libifp library. The interface is intended to mimic
       the ifp binary found in the ifp-line binary package.

       ifp can upload or download files or directories, delete or make directories on the device, format the device, or upgrade your firmware.

COMMANDS

       ls [directory]
	      List the files and directories on the device. The root directory is /.  Directories are preceded with 'd' and other files with 'f'.

       df     Display total and free space on the device.

       upload localfile remotefile
	      Copy the file named localfile to the iFP device, and name it remotefile. (This is like cp.)

       upload localfile remotedir
	      Copy the file named localfile to the iFP device, into remotedir.	(This is like cp.)

       upload localdir remotedir
	      Copy  the entire directory localdir to the device, into remotedir.  This copies into a subdirectory, so upload foo / puts files from
	      the directory foo info /foo on the device. (This is like cp -R.) This uploads the entire directory, not just audio files.

       put localfile | localdir
	      Upload the file or directory to the device, with the same name it has locally. If a directory is given, it is put in /.

       download remotefile localfile

       download remotefile localdir

       download remotedir localdir
	      Like upload, but copies from the iFP device to your system. Some proprietary file types may not be downloaded.

       get remotefile | remotedir
	      Like put, but copies files or directories from the device to your current working directory.

       rm [-r] file
	      Delete (recursively) a file (or directory) on the device.

       rmdir dir
	      Delete an empty directory on the device.

       mkdir dir
	      Create a directory on the device.

       battery
	      Display battery status of the device.

       typestring
	      Display the model number of the device.

       firmversion
	      Display the firmware revision currently on the device.

       format Reformat the device's memory. This will delete all your music.

       firmupdate FIRMWARE.HEX
	      Upload the file FIRMWARE.HEX as new firmware for the device. This will not delete your music, but may have  many	other  detrimental
	      effects.	Don't turn the device off or unplug it while the firmware is updating, and don't attempt to upload new firmware with a low
	      battery.

AUTHORS

       libifp was written by Geoff Oakham, based  on  ifp  by  Yamashiro  Jun.	 This  manual  page  was  written  for	Debian	by  Joe  Wreschnig
       <piman@debian.org>, but may be used by others.

								  May 30th, 2004							    IFP(1)
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