adding a subject tag to all files in a folder

[neebah]

I'm trying to add a subject tag to all existing files in a folder without altering the existing tags with the following command

exiftool "-subject<Scanned Binder #1" 2007

but I'm running into problems. 

[Hayo Baan]

Have you already tried this with += instead of <?

[neebah]

got it.  Thanks

[StarGeek]

Longer definition

Use Equal sign = when you want to assign a static value to a tag, overwriting previous values.
Use PlusEqual/MinusEqual +=/-= when you want to add/remove a static value to a list type tag, such as Subject or Keywords.
Use the LessThan < sign to assign the value of one tag to another tag. 
Use PlusLessThan/MinusLessThan +</-< when you want to add/remove the value of another tag to a list type tag.

[neebah]

Awesome thanks.  I was so worried that the sight was gone forever this weekend.  That's how much I depend on this forum.