Defaults, and Shell scripts

so I am trying to copy keys from one plist to another, and the following command works well from the command line:

Code:

defaults write com.sweetpproductions.SafariCookies `defaults read com.apple.Safari SCautomaticMode`

whereas the following post-install shell script does not?

Code:

#!/bin/sh


# remove unneeded defaults
#find all users
for arg in `ls /Users`
do

#copy preferences for all users, if it exists - ignoring the Shared folder
if [ $arg != 'Shared' ]; then
	/usr/bin/su $arg -c "/usr/bin/defaults write com.sweetpproductions.SafariCookie `/usr/bin/defaults read com.apple.Safari SCautomaticMode`"
	
fi
done
exit 0

I get the following error:

Code:

22/09/10 7:55:48 AM	defaults[895]	
Rep argument is not a dictionary
Defaults have not been changed.

can anyone tell me what I am doing wrong?

thanks in advance.

 

I tried, but it didn't work, but you got me on the right path, all I had to do was to escape the single quotations like so:

Code:

/usr/bin/su $arg -c "/usr/bin/defaults write com.sweetpproductions.SafariCookie \`/usr/bin/defaults read com.apple.Safari SCautomaticMode\`"

and it works great, thanks for the help.