How do i activate the latest nightly without knowing the date ?

[user789 via Digitalmars-d-learn]

After using the script to setup DMD nightly i read in the output 
that i have to
run "source ~/dlang/dmd-master-2018-01-04/activate" to have DMD 
DUB etc working.

Is there another activation command, working without the date, 
suitable for a cron job ?