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I searched the groups and can't find any info on this. I'm trying to pass Photoshop a command line that will either execute an action or (preferred) a script.
Your search must have broken because it's been covered in dozens of threads specifically addressing command-line processing. Use Google's Group search and search on "command line" and "Warren Sarle" for a heavy hit. Warren includes a reference to a javascript that can be run _inside_ PS as well.
A short answer here about the command-line in particular: you can have PS create a Droplet (an executable) which can be used at any time in the future. The droplet can be called from the command line along with the file or folder name you wish act upon - be certain the file or folder name is fully specified (device, path...)
For example: d:\clienta\imagesa\drop_copyright.exe
d:\clienta\imagea\massive\