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

[user789]

On Thursday, 4 January 2018 at 20:28:47 UTC, user789 wrote:
> 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 ?

"source ~/dlang/dmd-nightly/activate" doesn't work but would be 
better when you just want to use the nightly