I have some python scrtipts that I use to work with my smalltalk images. I will post them as soon as I get home (probably tomorrow)
With this scripts you can do something like
$ smalltalk open pharo 1.3 with cog
which does what you expect
although its quite hardcoded to my system and my needs so I will have to modify them a little bit before sharing to make them of any use for someone else.
Cheers
--
Alan Rodas Bonjour