In general shrinking a database is easy. This operation is done when an administrator wants to make database files smaller. It can be even done with SQL Server Management Studio. It becomes a little more complex when the database is tempdb. It is a system database that stores different types of temporary objects. As a consequence, it cannot be easily shrinked to reduce occupied disk space. This post contains a script that allows for that.
USE [TEMPDB];
GO
CHECKPOINT; GO DBCC DROPCLEANBUFFERS; GO DBCC FREEPROCCACHE; GO DBCC FREESYSTEMCACHE ('ALL'); GO DBCC FREESESSIONCACHE; GO DBCC SHRINKFILE (TEMPDEV, 1024); GO
It shrinks tempdb data file to 1024 MB.