Sorry, this probably a very basic question, but there's an awful lot of documentation to plough through before I can see if I can do this simple task.
I want to take the contents of the [Title] field, and the contents of the [Author] field, and write them to the [Caption] field with some fixed text in the form '[Title]', by [Author]. I want to do this as a batch job across all of the JPEGs in a folder. I'm not copying from one JPEG to another, just 'each to his own'. I appreciate that the field names might be slightly different in ExifTool, I am using the Photoshop names here.
If someone can point me at a command line to do this, I'd be most grateful. If I can do this, I will hone it further so as to only write if the target field is already empty, etc.
Many thanks.