I am new to bash, and I am creating a script that loops through the files in a directory and based on part of the filename, does something with the file, so far I have this:

#!/bin/bash
DIR="/Users/me/Documents/import/*"
for f in "$DIR"
do
  $t=??????
  echo "Loading $f int $t..."
done

so $f will output something like this: /Users/me/Documents/import/time_dim-1272037430173 out of this, I want time_dim, the directory can be variable length and -1272037430173 is a fixed length (it's the unix timestamp btw).

What is the best way to go about this?