I was configuring a product and had some problems, so I needed to clean up. I had hundreds of VSAM clusters. I started using ISPF 3.4 and using the delete line command, but you have extra typing to do for VSAM files, so I gave up.
I had a faint memory of using a MASK to delete things, and a quick search gave me
//S1 EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=*
//SYSIN DD *
DELETE COLIN.O.RTE.RK* MASK
Which deleted all my data sets.
Wasn’t this easy!