Remove Local User Accounts by UID

So you just need a way to ferret out the account names?

#!/bin/bash
for((i=1;i<7;i++)); 
do 
    condemned=$(dscl /Local/Default -search /Users UniqueID 50$i | cut -sf1);
         if [[ -n "$condemned" ]]; then 
            # Add preferred account nuking script or policy trigger here. Item below is not sufficient.
            dscl /Local/Default -delete /Users $condemned
        fi; 
done

Are you looking only to remove the user accounts from directory services, or the home folders for them as well?

I would prefer to wipe the home folders.
Would a line such as the below work in joshuasee's script?

rm -rf/Users $condemned

If you change it to:

rm -rf /Users/$condemned

added after the dscl -delete command, that should do it.

That will work for most purposes, but keep in mind groups memberships would not be cleaned up, so a future user created with the same ID may magically become admin or end up in groups you don't expect. Password hashes may be left behind, though would be unlikely to affect future users. Also, make sure you're comfortable with assuming the home folder is in /Users/, it isn't always. Scripts to delete a user can get pretty elaborate depending on how many edge cases you want to cover and how thorough a job you want to do.

Superuser - How can I delete a Mac OS X user account from Command Line?