Running shell commands with Automator: how to create a droplet launching an "exec" command? I need to create a automator application that launches the following exec command, whenever a image file is dropped onto it (the exec print the image files with some printing params).

exec('lpr -o ImageableArea=DS_8x6 -o PageRegion=DS_8x12 -o
PageSize=DS_8x12 -o media=DS_8x12 '.$fullPathOfTheImageFile);


How can I create this application? I can't go beyond this point:
In the Run Shell Script action, change Pass input:, (upper right hand corner of the action), from to stdin to as arguments. Then you can get the result of the previous action passed to a shell script as an argument. Example:
lpr -o ImageableArea=DS_8x6 -o PageRegion=DS_8x12 -o
PageSize=DS_8x12 -o media=DS_8x12 $1