There is an missing option in the doco for the select.
For this post No "COPY CUT" command? I wanted select all image files.
I though I could use Select "Image Files" FILTER but that would require setting up a predefined filter.
While its not documented here you can use Select grp:Images .
That's (implicitly) using the PATTERN argument. (It's the default argument, so the arg name PATTERN is optional. The command is the same as Select PATTERN=grp:Images.)
Docs for the PATTERN argument link to the pattern matching syntax which includes the grp:... pattern.
Could we add that as an example? I was a bit lost and had to guess.