Post Action Scripts

Just needing a little clarification on some post action scripts. When trying to execute some post actions I've read to refer to $3 in my destination paths. In an example I've tried something like this to set a login script: #!/bin/sh cd "$3"/ defaults write com.apple.loginwindow LoginHook "/Library/Management/scripts/byhostfix-105.pl" I wasn't able to get this to work. It does work if I execute it manually after imaging. Should I actually be putting $3 in my path of the LoginHook? I know I could try using MCX records and plan to experiment more with that, but if I don't get time I know I can use some login scripts I've used in the past. Any ideas? Thanks for any input! Steve