adding suffix to filenames (before the extension)

[athans]

Hello

I'd like to add a suffix, say _xxx to each filename, before the extension. But somehow I have not figured out the proper syntax.
I ended up using a silly and inefficient solution of using an empty tag:

Code Select Expand

exiftool '-testname<%f_xxx$usercomment.%e'  .

but this does not sound right, and any attempt to just use the string _xxx in the expression failed.
Understanding I'm missing the obvious, I'd appreciate some help on this.
Thanks

[StarGeek]

This is Common Mistake #5c, though the mistake is usually the other way around.

Use the Greater/Less than signs </> for copying tags.

Use the equal sign = when you're setting a static string.

exiftool '-testname=%f_xxx.%e'  .

[athans]

excellent. Obvious in retrospect.
Will brush up on common mistakes!